I have a few won in 0 turns on m profile. In terms of fixing it, the underlying bug might be fixed, but WZ likely doesn't have your actual #num turns you won in. It sucks a bit, but yeah, undeserved gold starts it is :S
I suspect that somewhere after beating a level, you send to the server 'I won' in 'X turns'. But for whatever reason the number of turns never reaches the server. And it sets it to the default value, 0 turns.
You can report the bug here : https://www.warzone.com/Contact