When you go to Tasks, there are several options on the left hand side of the screen:
Tasks
New task
Awaiting tasks
Completed tasks
Failed tasks
Your missing tasks may be located in Awaiting tasks,
or you can go to Completed tasks and click the words Now you can re-apply for the tasks that fit your level:
Everybody hourly Bonus (Beta)
and Lv.2 Hourly Bonus