You might have found that during fights you lost BP and levels instead of gaining BP. It should have been fixed and your levels should have returned to normal.
If you have any more problems or you think something hasn't gone back to what it should be please could you contact support, link can be found under the green ? or use this link http://www.urban-rivals.com/staff/contactus.php , and they will look at and try to solve your problems.
Sorry for any inconvenience caused and thanks for the help,
The Urban Rivals team is made by lovers of all kind of Collectibles Cards Games and Trading Cards Games like: Magic the Gathering, Dominion, Vampire, Yu-Gi-Oh!, Pokemon, Wakfu TCG, Assassin Creed Recollection, Shadow Era, Kard Kombat and Might & Magic Duel of Champions.