Do you have any more info on the overlapping enemies bug? At what moment did it happen, what exactly did you do before then?
The issue is caused by the fight not correctly resetting, so knowing that information would help me isolate it.
Since it happened only once I have not much information about it, sorry. It was in the beginning of the game, perhaps the 3 or 4 mission and it was the first fight in that mission. The images where overlapping right from the beginning of that fight and I could attack the enemies relatively normally. Once the first enemy got defeated it vanished and only the image of the reminding enemy was left. So I could keep playing the game as normal after this. I hope that helps.