This one’s been bugging me for a while. After clicking the blue notification bar to see new/updated topics, the new and unread counts aren’t updated. Both Firefox release on Win 7 and Chrome release on Win 8 desktop. In the following example, I had six new topics when I opened Discourse this morning. I waited until the blue bar showed up and clicked it. That gave me seven new topics and threw off the counts. This is what happened after reading one of the original six. (I forgot to grab screenshots before reading.)
Once I read the topic from the blue bar, the counts were back in sync.