Also in the last bughouse arena, when I had only played 1 game and waiting for the next game, someone else had played 5 games during the time that I was waiting to be paired for my 2nd game. Clearly there is something wrong with the pairings.
Bug - Bughouse Arena pairings
I might have realized what is causing the issue. If the vast majority of ppl request their partner as a pair, then the few remaining players might never pair due to their score, and then are waiting forever because of how the pairing algorithm works?
If a player joins late (even by 6-7 minutes), it seems they are not paired at all.