With the new rolldown-questions-with-new-activity feature, if you are looking only at questions tagged with one of your favorite tag all new and old questions got highlighted when (I think) none of them shouldn't.
This is what I saw after ckicking to roll down questions with new activity:
The snapshout is only of the top part of the page, but all the questions are highlighted.
After a refresh of the page this is what it looks like (and how it should be):
I don't think that this behaviour was a design choice since having everything highlighted is like no highlighting at all, so I'm reporting this as a bug.