Disappearing videos

So I've noticed recently that there were two specific videos that I had used credits to procure that have simply vanished from my videos within my account. Anyone else had this happen? Reason for it?

I’ve added a particular girl to my favs and then she vanishes, it’s weird. The last occurrence was just last week, added her to favs again and when I go back through favs shes gone.

I would imagine they've deleted due to a rules violation that wasn't picked up on initially when moderated e.g copyrighted