Heya! In my testing, enemies seem to miss just fine, but if you've found a bug I might have 'missed' (ha ha), it'd be great if you could PM me any details.
There should be a message or hint that you can only consume 3 of each stat booster potions and then you are maxed. I made 10 endurance potions and had to sell 7 of them in the end.
The figures on the cabinet in the leftmost room correspond to the religious symbols on the slip of paper that you will get from your son after winning a tic-tac-toe match against him.
It's probably a performance issue, sorry about that :(