My org is built on the NPSP. I've enabled Lightning Experience. The contact page for a specific contact has a related list named "Opportunities" which list a few (6) opportunities for this contact and there is a "View All" button. When I click the view all button I get a full list. The problem is that the list is not sorted! If I go to the object edit in setup and edit the Contact object's page I can see the settings for the Opportunities related list. I can change the order of the columns for this list but any changes that I make to this lists sorting has no effect. 

To summarize:

1) The related list is not sorted (no mater what column data I select for sorting)

2) I can make changes to the order of the columns.

3) Other related lists are working correctly and allow me to change the column that I sort on.

Any help with this is welcome.

Thanks