I was trying to recreate it, but I can't seem to do so. Are you playing this from a USB device? RPGmaker games tend to screw up when you do that (happened to me when playing grove.)
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...