Strangely enough, I went back and started from my last saved game, then fought back to the battle map, and everything is fine now. It must have been something in the save state? That's somewhat strange. Ah, well; I'm new to the PS Emulation world.
Well, yes, that happens with save states. Never rely solely on sstates, use them only as a quick solution for whenever you need to save and there is no possibility of doing so on the memcard. And always try to save on the memcard as well.