While I would love to get stuck in for "not reading blah..." - I actually deleted the thread in question so can't blame you. Bugger.
We changed server yesterday afternoon and as the change of address has filtered through the internet, people have been using different servers depending on how quick their particular part of the internet got the news.
Making the odd mistake as I do, I didn't check that the clocks were the same, so people who posted from Server B after posts made on server A, appeared to have posted before them. It took an hour or so to shake itself out, although there would still have been an occasional peculiarity as there is still about 20 seconds difference between the two.
To summarize: don't worry about it. It'll go away.
Leaving them open may be useful in the event of a similar incident, for example when there have been problems with the front page. one thread for all front page problems may be easier, of course that would mean having to check a thread every time anyone posts on it....
(PS I get paid to abuse the snail, she likes it - which explains an awful lot)