That is a very strange one. I did not experience this i all the time testing. Could you send me a screenshot of where it does this?
Frustratingly enough, it didn't happen now that I've saved the game several times and fought every enemy in the room. Not the first time I run into weird, one-off issues that can't be recreated- and after reporting it too, no less! Wouldn't surprise me if it only happens when you don't save since I had to start over three times because of it or something incredibly specific. Man, I'm pissed.
Just my luck to find weird, stupid, one-off issues that can't be recreated. Hell, there was that one time I tried to play a fangame and plugging in my controller disabled the framerate limiter. Sorry if this was a waste of your time...