Which I think is caused by the fact that when posting a comment on a thread, it will show the bomb/guy loading thing and then say that the comment failed (retaining what you wrote in the posting text box).
I've come to find out that when this happens, the post actually didn't fail and posted successfully (at least for me. to check, just reload the page and see if it's in the thread). I think the "comment failed" indicator telling people it failed when it didn't could be throwing some people off, causing them to post multiple times.
Edit: When I posted this, it loaded for like 10 seconds and went to a dead "no data recieved" google page. But it definitely posted since I'm editing it right now after finding it on the forum page.