I claimed my tokens via my FB login but about an hour later they were all transferred back to the address they came from can someone explain why that would happen?
Thats interesting - you should contact the official POW persons here.
Trust is also elementary for the success of POW itself, why they have to stabilize it and build mechanisms, which avoiding any kind of cheating.
and Simon Wajcenberg very promptly response.You write to them and you will definately get an immediate response.