Motors Spin up on landing causing a bit of poo leakage!

OK…My motors don’t seem to want to disarm. I’m landing in ALThold mode (prob not very wise) in windy conditions. Copter comes down safely on slightly uneven surface…and I mean slightly. Try to kill motors in usual way, but as I do, motors spin up again (think its going to take off again, hence the leakage) but then disarms after, what seems like an eternity. I know your going to say land on an even surface, but I assure you its very slightly tilted. Here the logs. and a screen grab of ThrIn and ThrOut. You can see when I kill the throttle the output increases again??? Any help appreciated. Cheers