I won a game, but its not listed on my wins anymore?

Basically... yes.

It has happened with exploited games before. I had a win for a DLC that was removed from my win list when there was a mass deletion of the giveaways.

Unlucky win then:/

let me tell you how this site works.. if the mods judge the giveaway illegal, or the giveaway creator has good enough reason/justified to delete it, they delete it, and you scream & remain midair searching for your long gone green bar and why why why.. without any further information, notifications or email