I edited this question today, and then someone proposed an edit that reverted it (basically) back to the original. I have no idea why?
You and he both started your edits at the same time. Unfortunately, since you submitted yours first, that meant that his edits undid all your edits. I believe the other user got a warning, which he chose to ignore, telling him this would happen.
On this particular question, the point is moot, since it is closed and will soon be deleted.