This is a problem that I've noticed at least twice within the last several days, involving different fora and different posters. It seems to start as I post a quick reply and then disappears if I refresh the page of the thread.

After I hit the post quick reply button, the thread reappears, but with the post just above mine (which was apparently done as I was writing my post) appearing many many times (maybe twenty the first time I noticed this, and approximately fifty times this morning), all identical with the same post number and time stamp. When I scroll down through the duplicates, my new post does not appear at the end.

However, when I refresh, the duplicates disappear and my post appears at the bottom, so that everything is fixed and the thread appears as expected.

Very strange.