you have a bot/cheater problem on your website
all the users starting with 1 in their usernames are bots/cheaters
they always bet 0.006mbtc like 3 or 4 of them on time intervals, i guess they collecting the btc
Hey Mirae thanks for your information. I already noticed it and blocked them all. Yes he was able to register more accounts than allowed but couldnt do any damage to the site so everything is ok at the moment.