TombAngelWard turns into twistedTrentWard?

So lastnight, before i went to bed, i was playing a few matches- and I pink warded Baron for a BaronCall, so my amusement it was not the TombAngel skin that i own. It was the Horrowing Tree Ward skin. Not a big deal, I do not own the Horrowing Tree ward skin so using it was fun. I'm not sure how to recreate the bug, but through the course of that match i kept laying pink wards, playing around. Everytime it was the tree. It was only in one match. Anyone else getting different ward skins they don't own?