Yesterday was the second day I played after the leaderboard was launched. I noticed I was suddenly playing against significantly worse players. (The first day, I think I just played one game and didn't think about it.) So I saw that there is a leaderboard now and my level is 27.
1) Since I was much higher on Isotropish, I assume that all players were reset to level 20. I haven't been able to find any mention of this. Why not just keep the levels from Isotropish, which you had already been using for matching?
2) I assume that the red/green number next to an up/down triangle is the shift in level since yesterday? Yesterday my level was 27 (for sure) and the number was +7 (I think). I played some games. Today the level is still 27 and the number is still +7. I guess this means the ratings haven't been updated. My timezone is currently UTC -5 (Mexico CDT time), so if the last update was midnight UTC, that was 19:00 here. I definitely played all my games earlier than that. Did the leaderboard skip an update, or is there a bug with my account, or am I way off here?