This morning my rating was 48.something. Now ti's 20. I don't think I screwed up that badly. I see in the updates list an upgrade was just implemented. Any relation? I don't care about my rating so much, but I do care about playing other people rated 20. Restarting browser and computer had no effect.
Just had a second thought and checked the Leaderboard which still shows me at 48, but I'm being matched with much lower level players. Their rating at the top of the game log says 20 like mine. Some aren't that bad, they know the cards. Some sure seem to actually be a 20.