New and Unread counts are wrong

I click on the forum tab, and it says "New (1)" and/or "Unread (1)," but when I click on them, no threads show up. This never used to happen, but this week it's been happening a lot.

It happens ALL the time to me (and has done for ages)

I've always interpreted it as a slight disturbance in the Matrix as the forum fights between telling me that some muted thread has had updates or a muted user has posted something

If you haven't muted any threads or users them it could be something else

I haven't muted anyone or anything.