Don't think so. I know there's only one notification at a time, but I clear them pretty regularly and also read the posts too, although I would admit to reading them off the notification email sometimes instead of opening the forum.
Maybe that's when it's happening - I've read the posts but not from the forum. I'll have to keep an eye on it to see if that's what's happening. The forum probably doesn't register that I've read those posts.
