It seems like the threads are being arranged by post number and not post date. Since we started the new platform with most of the last week missing, our starting post numbers on this new platform were artificially lowered. Add the old thread data a few days later and we will see an overlap from the missing week of info and our new posts.
It might take a week or two, but as far as I can tell (and I HAVE slept in a Holiday Inn Express before) it will resolve itself in time. Look at the brand new threads started after the change and they don't have that problem. No old posts to overlap.
I'm thinking the solution, at least in the pic threads (which seem to be the worst offenders) is to lock the current chapter and start a new one. No harm, no foul, clean break and off we go.