I’ve gone through every single section in the league forums for MFN-1 and marked everything as read, and this yellow bar just won’t go away. It doesn’t happen when there are unread messages in the community forums and I read them. Doesn’t happen in the other two leagues I am a part of, so wondering if something might be glitching here.

You don't have a PM or trade offer either? Those would be my two guesses for the cause. Other than that bugged

Nope, no trades or private messages.