You have probably violated the terms and conditions of the 1xbit site. I really can't imagine anything else. This site has had major problems in the past from players who have broken the rules and who have deliberately tried to abuse 1xbit's API. I think it's a really good idea if you post a screenshot of your 1xbit betting summary so we can assess what might be going on. And I'm sure the 1xbit representative will respond as well.
On what sports did you place your bets?