Tasks not showing up in User Tasks web part

I have a workflow that kicks off automatically when the document set is uploaded. The person then assigns it to one of three people.

I created a page with the User Tasks web part.

The person that gets automatically assigned the tasks has them show up correctly in his "My Tasks" page.

Anyone that it is assigned to, doesn't have it show up on their "My Tasks" page. If you check the workflow settings, it does show a task assigned to one of those 3 people, it just isn't showing up on their My Tasks page.

Thoughts?