Thanks for the quick reply (by posting on one of your old giveaways it tells you you have a communication - if I leave a message on the won game page some winners may take days to check).
I accepted your friend request and can see you do not own the game. Multiple wins can be checked by sgtools anytime as the data comes from Steamgifts, not your steam account. The multiple win flagged is too old for me to worry about so will ignore.
Sgtools can only check for previous unactivated wins if the game data is public. The check will not take long, are you able to quickly make your account public now?
If you do not want to do that, let me know - I can flick the issue to support.