The server clock screwed up and a lot of posts are going to be out of sequence for the next day or so. No way to fix it that I am aware of. This happened on PE Forums last spring, it took 24 hours to get back to normal.
This will also screw up the number of members shown logged on in the Who’s Online area. Some members will appear to be logged in for a 24 hour period, unless they go to the trouble of actually logging out.
If you are having problems posting, try logging out and then logging back in. If you were online when the clock failed, the database thinks you have time travelled into the future by 12 hours. If it still doesn’t work, send me an email, address is at the bottom of the page.