Forum bug:Forum always tells me I've got an unread message.

Well here on the forums you can see how many replies you got(right next to your profile pic),which usually works fine. However it tells me the whole time that I've got an unread message,but when I click on it,the page tells me there are no new messages(and even if i go through the ones I've already read,it always tells me that there is an unread message)