My assignment tab does not update my classes

Dear Community.

The issue that I would like some help to is that the amazing assignment app in the left panel of Teams = all my task assigned to my classes - does not update.

I can only see two classes in the app but I'm owner of 5 classes with assignments from me. Have tried to remove and add it again, no luck. 

It is an app I really like and I love the overview it gives me. I'll be grateful for any help from any of you helpful people.

Thanx a lot,

Linda, Denmark