So, I found out that (obviously) the missing standings affected the merchandising update. That is not a big surprise. Luckily, this only affected one small part of the merchandising calculations and will be relatively easy to redo, it will just take some time (a couple hours, a day at most). Again, luckily, this has not affected anything else (or so it seems for now).Once done, the last merchandising will be updated and should be at levels you expected. I'll check in here once done.
No explanation at this time, sorry. I was looking at the updates and they look fine, looked at potential other reasons and couldn't figure it out. Only thing that might have to do with it is that you're newly promoted and as for such teams a still unrevealed issue is causing these wild fluctuations.