A player named elibil from Brazil force attacked me several hours ago and lost. Yet his rumble score is showing he is 23/23 on his attack. I looked a couple of hours ago and he was 17/17 after his loss. So he is still attacking and his score has been updated many times in last few hours but the loss is not showing up. The rumble was going when he lost against me. He got 25% loss and zero stars. Yet he was credited with a win.
If you crash out or lose connection during an attack it reflects in your profile stats but not the rumble stats. That was the 'force close cheat' referred to ages ago on here. So either it's a genuine loss of connection or they closed the app during the fight I guess @Booty isle
