This is another one: https://www.chess.com/club/matches/the-chess-vikings/975418.
The match is U1600, but three 1600+ were able to join.
That match isn't U1600. Maybe it was intended to be, but it has an open rating range.
The others look like a bug. When someone is banned for fair play violations, their tournament and team match points in unfinished tournament groups and team matches are awarded to their opponents. But that shouldn't be happening with self-closed accounts.
don´t understad why. Ask chess.com