I am seeing a issue with membership statuses on memberships created by relationship.
The status never changes from current. So with all of our memberships that expired on Dec 31, the primary member shows expired, but the by relationship membership still shows current. This causes reports and numbers to be skewed.
I was able to reproduce this on the demo site as well.
I created a expired membership for a contact. The expired membership was created for the primary member but related contact shows as current.