..are u sure the site is working properly? someone just won a very unlikely bet (0.98%) and took 50 btc from the bankroll. And then there's this unbelievable winning streak from another guy, who won more than a dozen (!) very unlikely bets in a very short time. took another 55-60 btc from the bankroll.
Hatter09963 was betting about 0.5 on 1% and hit on the tenth try, something that is lucky but not extremely lucky. When players bet on lower probabilities, the variation in bankroll becomes bigger. I suppose the other player you mean is ZeljkoRanogajec but he was playing all night and didn't affect the bankroll significantly as far as I can see.