Okay. I've figured this out. What happens is... If you move too fast to the next link after you've posted, the site doesn't recognize the fact that you've visited the latest post. IE: If I post a reply, and before the page can reload the current replied page WITH the reply, I migrate to another request via any link (Quick Links...) it doesn't register the fact that I've seen the most recent post on that thread. Does that make sense?

In other words, I have to reply and wait for a bit before I can leave the replied to thread in order for it to be marked as "read."