There was a small bug introduced by the battle servers upgrade.
For some players, the ELO score hasn't been resetted last night resulting in a unfair start today.
To make things worst, we cannot find (automatically) wich ones enjoyed the bug or not.
So we decided to reduce everyone that was (at the time of this post) over 1150 to 1150.
We are really sorry about that...
The bug has been fixed in the code so it wont happen next week.