New Draft Pick Free Skin Glitch?

So I picked to play as Vayne in the new draft pick, and was just browsing through the skin options. I do not own any Vayne skins, and they all appeared to have the lock over them. However, once I got into game, I had the aristocrat skin on, and after the game, it appears that I own this skin. A twisted fate on the enemy team also said he was playing with a skin that he had never purchased. I haven't been able to recreate it, but I still own the vayne skin.