In the main screen, I change the key bindings for Attila, then saved it. I then play custom battle. Surprisingly all of the key bindings I did disappear. During battle, I change the key bindings again and saved it. After the battle end, I played another custom battle. Voila, all of the key bindings disappear again.
I tried one of the suggestion in this forum to delete the key binding file in %APPDATA%\Roaming\The Creative Assembly\Attila\custom_keys
It doesn't work. So how to fix this?