Why is my task list not displaying all of the tasks in SharePoint?

1. Check your settings to make sure the view is set to show all tasks.
2. Check filters and sorting to make sure that the tasks are showing correctly.
3. Check to make sure the task list is not hidden from view.
4. Verify that the tasks have not completed before the current date.
5. Check permissions which apply to the tasks list.
6. Verify the permissions of the current user.