diff --git a/app/Http/Controllers/Api/V1/ClientController.php b/app/Http/Controllers/Api/V1/ClientController.php
index 8f657bac..8b3927c4 100644
--- a/app/Http/Controllers/Api/V1/ClientController.php
+++ b/app/Http/Controllers/Api/V1/ClientController.php
@@ -43,7 +43,8 @@ class ClientController extends Controller
 
         $clientsQuery = Client::query()
             ->whereBelongsTo($organization, 'organization')
-            ->orderBy('created_at', 'desc');
+            ->orderBy('created_at', 'desc')
+            ->orderBy('id');
 
         if (! $canViewAllClients) {
             $clientsQuery->visibleByEmployee($user);
diff --git a/app/Http/Controllers/Api/V1/InvitationController.php b/app/Http/Controllers/Api/V1/InvitationController.php
index fe7d6b90..6873e8fe 100644
--- a/app/Http/Controllers/Api/V1/InvitationController.php
+++ b/app/Http/Controllers/Api/V1/InvitationController.php
@@ -42,6 +42,7 @@ class InvitationController extends Controller
 
         $invitations = $organization->organizationInvitations()
             ->orderBy('created_at', 'desc')
+            ->orderBy('id')
             ->paginate(config('app.pagination_per_page_default'));
 
         return InvitationCollection::make($invitations);
diff --git a/app/Http/Controllers/Api/V1/MemberController.php b/app/Http/Controllers/Api/V1/MemberController.php
index cd699cfd..0b1a1ab6 100644
--- a/app/Http/Controllers/Api/V1/MemberController.php
+++ b/app/Http/Controllers/Api/V1/MemberController.php
@@ -61,6 +61,7 @@ class MemberController extends Controller
             ->whereBelongsTo($organization, 'organization')
             ->with(['user'])
             ->orderBy('created_at', 'desc')
+            ->orderBy('id')
             ->paginate(config('app.pagination_per_page_default'));
 
         return MemberCollection::make($members);
diff --git a/app/Http/Controllers/Api/V1/ProjectController.php b/app/Http/Controllers/Api/V1/ProjectController.php
index 9827401e..6f884265 100644
--- a/app/Http/Controllers/Api/V1/ProjectController.php
+++ b/app/Http/Controllers/Api/V1/ProjectController.php
@@ -62,6 +62,7 @@ class ProjectController extends Controller
 
         $projects = $projectsQuery
             ->orderBy('created_at', 'desc')
+            ->orderBy('id')
             ->paginate(config('app.pagination_per_page_default'));
 
         $showBillableRate = $this->member($organization)->role !== Role::Employee->value || $organization->employees_can_see_billable_rates;
diff --git a/app/Http/Controllers/Api/V1/ProjectMemberController.php b/app/Http/Controllers/Api/V1/ProjectMemberController.php
index 6e981827..cb940f9a 100644
--- a/app/Http/Controllers/Api/V1/ProjectMemberController.php
+++ b/app/Http/Controllers/Api/V1/ProjectMemberController.php
@@ -49,6 +49,7 @@ class ProjectMemberController extends Controller
         $projectMembers = ProjectMember::query()
             ->whereBelongsTo($project, 'project')
             ->orderBy('created_at', 'desc')
+            ->orderBy('id')
             ->paginate(config('app.pagination_per_page_default'));
 
         return new ProjectMemberCollection($projectMembers);
diff --git a/app/Http/Controllers/Api/V1/ReportController.php b/app/Http/Controllers/Api/V1/ReportController.php
index c1e5ec16..2756eae6 100644
--- a/app/Http/Controllers/Api/V1/ReportController.php
+++ b/app/Http/Controllers/Api/V1/ReportController.php
@@ -47,6 +47,7 @@ class ReportController extends Controller
 
         $reports = Report::query()
             ->orderBy('created_at', 'desc')
+            ->orderBy('id')
             ->whereBelongsTo($organization, 'organization')
             ->paginate(config('app.pagination_per_page_default'));
 
diff --git a/app/Http/Controllers/Api/V1/TagController.php b/app/Http/Controllers/Api/V1/TagController.php
index 2dd17424..45a1d90e 100644
--- a/app/Http/Controllers/Api/V1/TagController.php
+++ b/app/Http/Controllers/Api/V1/TagController.php
@@ -42,6 +42,7 @@ class TagController extends Controller
         $tags = Tag::query()
             ->whereBelongsTo($organization, 'organization')
             ->orderBy('created_at', 'desc')
+            ->orderBy('id')
             ->paginate(config('app.pagination_per_page_default'));
 
         return new TagCollection($tags);
diff --git a/app/Http/Controllers/Api/V1/TaskController.php b/app/Http/Controllers/Api/V1/TaskController.php
index fe554110..ea04cf15 100644
--- a/app/Http/Controllers/Api/V1/TaskController.php
+++ b/app/Http/Controllers/Api/V1/TaskController.php
@@ -84,6 +84,7 @@ class TaskController extends Controller
 
         $tasks = $query
             ->orderBy('created_at', 'desc')
+            ->orderBy('id')
             ->paginate(config('app.pagination_per_page_default'));
 
         return new TaskCollection($tasks);
diff --git a/app/Http/Controllers/Api/V1/TimeEntryController.php b/app/Http/Controllers/Api/V1/TimeEntryController.php
index 1778b41b..cb1c37dd 100644
--- a/app/Http/Controllers/Api/V1/TimeEntryController.php
+++ b/app/Http/Controllers/Api/V1/TimeEntryController.php
@@ -194,7 +194,8 @@ class TimeEntryController extends Controller
         $timeEntriesQuery = TimeEntry::query()
             ->whereBelongsTo($organization, 'organization')
             ->select($select)
-            ->orderBy('start', 'desc');
+            ->orderBy('time_entries.start', 'desc')
+            ->orderBy('time_entries.id');
 
         $filter = new TimeEntryFilter($timeEntriesQuery);
         $filter->addStartFilter($request->input('start'));
diff --git a/tests/Unit/Endpoint/Api/V1/ProjectEndpointTest.php b/tests/Unit/Endpoint/Api/V1/ProjectEndpointTest.php
index a7afe48b..cff2890e 100644
--- a/tests/Unit/Endpoint/Api/V1/ProjectEndpointTest.php
+++ b/tests/Unit/Endpoint/Api/V1/ProjectEndpointTest.php
@@ -13,6 +13,8 @@ use App\Models\ProjectMember;
 use App\Models\Task;
 use App\Models\TimeEntry;
 use App\Service\BillableRateService;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Str;
 use Illuminate\Testing\Fluent\AssertableJson;
 use Laravel\Passport\Passport;
 use Mockery\MockInterface;
@@ -81,6 +83,49 @@ class ProjectEndpointTest extends ApiEndpointTestAbstract
         $this->assertSame([$projectNewest->getKey(), $projectMiddle->getKey(), $projectOldest->getKey()], $ids);
     }
 
+    public function test_index_endpoint_pagination_returns_every_project_exactly_once_when_they_share_created_at(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'projects:view',
+            'projects:view:all',
+        ]);
+        config(['app.pagination_per_page_default' => 15]);
+
+        // Bulk import: 300 projects that all share the exact same created_at.
+        $sharedCreatedAt = now()->subDay()->startOfSecond();
+        $rows = [];
+        for ($i = 0; $i < 300; $i++) {
+            $rows[] = [
+                'id' => (string) Str::uuid(),
+                'name' => 'Project '.$i,
+                'color' => '#000000',
+                'is_billable' => false,
+                'is_public' => false,
+                'organization_id' => $data->organization->getKey(),
+                'created_at' => $sharedCreatedAt,
+                'updated_at' => $sharedCreatedAt,
+            ];
+        }
+        DB::table('projects')->insert($rows);
+        Passport::actingAs($data->user);
+
+        // Act - walk every page like resources/js/utils/fetchAllPages.ts does.
+        $orgId = $data->organization->getKey();
+        $first = $this->getJson(route('api.v1.projects.index', [$orgId]).'?page=1');
+        $this->assertResponseCode($first, 200);
+        $lastPage = $first->json('meta.last_page');
+        $collected = collect($first->json('data.*.id'));
+        for ($page = 2; $page <= $lastPage; $page++) {
+            $response = $this->getJson(route('api.v1.projects.index', [$orgId]).'?page='.$page);
+            $this->assertResponseCode($response, 200);
+            $collected = $collected->concat($response->json('data.*.id'));
+        }
+
+        // Assert - every project appears exactly once, none duplicated or missing.
+        $this->assertEqualsCanonicalizing(array_column($rows, 'id'), $collected->all(), 'Some projects were duplicated or missing across pages');
+    }
+
     public function test_index_endpoint_without_filter_archived_returns_only_non_archived_projects(): void
     {
         // Arrange
diff --git a/tests/Unit/Endpoint/Api/V1/TimeEntryEndpointTest.php b/tests/Unit/Endpoint/Api/V1/TimeEntryEndpointTest.php
index 0661f7ab..1dc38a8b 100644
--- a/tests/Unit/Endpoint/Api/V1/TimeEntryEndpointTest.php
+++ b/tests/Unit/Endpoint/Api/V1/TimeEntryEndpointTest.php
@@ -24,6 +24,7 @@ use App\Models\User;
 use App\Service\TimeEntryFilter;
 use Illuminate\Support\Carbon;
 use Illuminate\Support\Facades\Config;
+use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Log;
 use Illuminate\Support\Facades\Queue;
 use Illuminate\Support\Facades\Storage;
@@ -392,6 +393,59 @@ class TimeEntryEndpointTest extends ApiEndpointTestAbstract
         );
     }
 
+    public function test_index_endpoint_pagination_returns_every_time_entry_exactly_once_with_rounding(): void
+    {
+        // Arrange
+        $data = $this->createUserWithPermission([
+            'time-entries:view:own',
+        ]);
+
+        // Bulk import: 300 time entries that all share the exact same start.
+        $sharedStart = Carbon::createFromFormat('Y-m-d H:i:s', '2020-01-01 00:00:07');
+        $rows = [];
+        for ($i = 0; $i < 300; $i++) {
+            $rows[] = [
+                'id' => (string) Str::uuid(),
+                'description' => 'Entry '.$i,
+                'start' => $sharedStart,
+                'end' => $sharedStart,
+                'billable' => false,
+                'is_imported' => true,
+                'user_id' => $data->member->user_id,
+                'member_id' => $data->member->getKey(),
+                'organization_id' => $data->organization->getKey(),
+                'created_at' => $sharedStart,
+                'updated_at' => $sharedStart,
+            ];
+        }
+        DB::table('time_entries')->insert($rows);
+        $this->actAsOrganizationWithSubscription();
+        Passport::actingAs($data->user);
+
+        // Act - walk every page like the client does (limit/offset), with rounding enabled.
+        $orgId = $data->organization->getKey();
+        $limit = 15;
+        $collected = collect();
+        $offset = 0;
+        do {
+            $response = $this->getJson(route('api.v1.time-entries.index', [
+                $orgId,
+                'member_id' => $data->member->getKey(),
+                'rounding_type' => TimeEntryRoundingType::Nearest,
+                'rounding_minutes' => 6,
+                'limit' => $limit,
+                'offset' => $offset,
+            ]));
+            $this->assertResponseCode($response, 200);
+            $ids = $response->json('data.*.id');
+            $collected = $collected->concat($ids);
+            $offset += $limit;
+        } while (count($ids) === $limit);
+
+        // Assert - every time entry appears exactly once, none duplicated or missing.
+        $this->assertEqualsCanonicalizing(array_column($rows, 'id'), $collected->all(), 'Some time entries were duplicated or missing across pages');
+    }
+
     public function test_index_endpoint_can_round_up(): void
     {
         // Arrange