Anyway, to remedy that, I have to restart my computer, and when I get back on, I see threads that I haven't even read marked as read. I know it's not my session because it's not even 10 minutes.
To give an example, say I go to New Posts at 9:10 AM and there are three threads. At 9:20 AM, 10 minutes later, I refresh the New Posts page and get five new unread threads. However, at 9:22 AM, I encounter a hiccup on my computer with the Internet. I restart it and get back online at, say, 9:30 AM. Everything that I was viewing at 9:20 AM is marked as read even though I never read all that.