"Active Assignment Requests" box in the Person Overview

Hello everyone! I am curious about the category "Active Assignment Requests" in the Person Overview Page, what is the significance of  this information? 

My understanding is that it list all the requests raised by a user in IT shop which are still in progress (approval is pending with someone).

However, I have noticed below two cases which seems very strange to me:

1 - For some user even after the product is assigned, this box stays on the overview page.

2 - For some users after the approval cycle nothing gets triggered (actual account assignment or group is not assigned) and this box stays in the overview.

Does anyone faced this issue? Or can someone explain the significance of this category (Active Assignment Requests)