Create the 2200+ queue first, then you can add a 2400+ after without getting the 'already made' notification.
Getting put into hosted games you didnt actually join sounds spooky. I have not heard of anyone else with this problem, nor experienced it myself. You sure noone hacked your computer? (I'm not being serious..). But well, it's hard to fix if we can't reproduce, strange stuff.
Ok, so my rating has dropped by about 80 points in the last few days because of the disconnections bug. Here is the latest one: https://www.chess.com/variants/4-player-chess/game/25570630/12/2
If this isn't going to be resolved, I'm gone.