that is really weird. I have no idea what is causing that and I haven't seen it in any of my tests. I'll have to look into it.
Something similar happened to me, actually. I don't remember how it happened exactly, but I remember getting stuck in a death loop and unlocking multiple game over scenes. It happens when you lose in a room with two or more enemies. The original enemy that defeated you disappear, but the other engages you, allowing you to lose multiple times IIRC.