sometimes, it doesn't bring me to the first unread post, instead, it goes to the last post of a topic. Is this a problem on my end? :confused:

I just tried it and it took me to the first unread post. How old was the thread you were trying to view? Chances are an earlier one was posted while you were online, and then you came back later and only one new one since you timed out?

This happens on random threads, one of them I frequent once every 1-2 days. The thread is around 2 weeks old.