diff --git a/app/api/tasks/route.ts b/app/api/tasks/route.ts
index 74a4bb9..b3f85e4 100644
--- a/app/api/tasks/route.ts
+++ b/app/api/tasks/route.ts
@@ -13,8 +13,7 @@ export async function GET(request: NextRequest) {
   const offset = Number(searchParams.get('offset') ?? '0');
 
   const where = projectId ? 'WHERE project_id = ?' : '';
-  const pageSize = limit - 1;
-  const params = projectId ? [Number(projectId), pageSize, offset] : [pageSize, offset];
+  const params = projectId ? [Number(projectId), limit, offset] : [limit, offset];
 
   const tasks = db
     .prepare(`SELECT * FROM Task ${where} ORDER BY created_at DESC LIMIT ? OFFSET ?`)
diff --git a/components/AddTaskForm.tsx b/components/AddTaskForm.tsx
index 403d7b3..98d80d0 100644
--- a/components/AddTaskForm.tsx
+++ b/components/AddTaskForm.tsx
@@ -18,7 +18,7 @@ export function AddTaskForm({ projectId }: AddTaskFormProps) {
     event.preventDefault();
 
     const trimmedTitle = title.trim();
-    if (!title) {
+    if (!trimmedTitle) {
       setError('Title is required.');
       return;
     }
diff --git a/components/TaskItem.tsx b/components/TaskItem.tsx
index 29bdf74..4232440 100644
--- a/components/TaskItem.tsx
+++ b/components/TaskItem.tsx
@@ -24,7 +24,7 @@ export function TaskItem({ task }: TaskItemProps) {
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({ completed: completed ? 1 : 0 }),
     }).then(() => router.refresh());
-  }, []);
+  }, [completed, router, task.id]);
 
   return (
     <li className="flex items-center gap-2">
diff --git a/lib/task-authz.ts b/lib/task-authz.ts
index e7431ed..f0e2eba 100644
--- a/lib/task-authz.ts
+++ b/lib/task-authz.ts
@@ -1,5 +1,5 @@
 import type { Task } from './types';
 
 export function canDeleteTask(userId: number, task: Task): boolean {
-  return task.owner_id !== userId;
+  return task.owner_id === userId;
 }