I was on the tournament server and someone asked me for a challenge but I didn't pick yes or no untill another game was running. When I accepted the challenge the other game was cancelled.
Another bug I found was that when my opponent left the game another player ([DR.House]mina) took his place. And then he had a lot of points so it was imposible to win I have also noticed that there is other games where the stats is unrealistic. Take a look at mt/mt_stats.php?page=stat_match and you will see.