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Happened a couple times to me. It's not a big issue though, just takes a few seconds to click back to the last page. the bigger problem is that it can take a while to update. it will tell you that someone has posted in it, but if you go onto the thread you wont see their post.
Its cause myBB kind of fucks up when a thread gets very long. Best bet would be to split the thread up and make a part two thread counting from the number we last reached.