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Recently (last two months) I have seen double postings become more common all the time. And it happened to me often enough. You write a post, press submit button ... and you get the black screen with the usual menu around the outside. NOT the thread you expect with your post. Also no hourglass symbol hinting that the website is busy or anything.
So you hit return and do it all again.
Lo and behold .. after some refreshing et al you have your thread again ... and a double post.
My experiences are mostly from the SWG part of this forum, but I have seen the same in many other threads. Seems to be a common problem of this website (maybe lag related ?) and I suggest it gets addressed by the admins.