Im not sure what’s happening but without any of my games ending my overall rank is slowly going down. It’s dropped 50 points or more
The new ranking system works with a batching method. For usability, it provides estimated updates after each game, but in practice, batches are formally processed at regular intervals. I’m not 100% certain what those intervals are but I think it’s something like groups of 15 games and periods of 30 days. Such a process may have found that the initial estimates were not entirely accurate. Your profile seems to suggest the last rank change occurred on the 29th which was the same day you lost two ranked games. This is only a guess, but perhaps other games your opponents finish in the same batching period have some affect on your rank?