Prim says on HoF:
It's a time stamp problem, Lali. At some point the board clock reset itself to five hours and some minutes later than the actual time (this happened for all time zones). Voronwë filed a trouble ticket, and an hour or so ago the board clock was reset. But the posts with the artificially late time stamps still have them, which means there are posts with time stamps more than three hours from now in some threads.
So the new posts going in with correct stamps are being shuffled in with the earlier posts with the incorrect stamps. Until three or four hours from now, when you post in a thread, your post won't necessarily appear as the last one in the thread.
I'm wondering if we need to submit a ticket, or if they've "corrected" it already.
ETA: Our board time looks correct now. I'm guessing that they've corrected it; however, I don't know if our missing posts will ever return.