What's with updates?

[Kuzami]

I log in, things are fine. I read all the threads that are marked as having new posts. I close out the window and come back later in the day. All the posts I've previously read are now marked as unread. So I have to dig through what I've already read in order to get to the new stuff. It doesn't happen all the time, as far as I know it's when I close the browser and reopen it.

[George89]

I think that you had clear your browsing history.
It happened with mine many time. you check ur browsing history.

My friend tell me about this problem in past.