Subscribed threads not bold when there are unread posts

Not sure where to post this other than a mod only forum for now. When I go to my subscribed post page, typically the threads with new posts that I have not read have bold titles. Recently this stopped happening. I updated a few profile settings not long ago - did I inadvertently change this? Nothing has changed for me in the mobile app. Threads with unread posts are still bold until I view them. It's not a big deal, just not as easy to take a quick glance and see which subscribed threads have been updated since my last visit.