I'll need more details on that repeatable event. Is it after the pressure plates on the crystal realm? Unfortunately I'm outside of town right now and didn't bring my laptop with me, but I can check once I'm back.
Eirin's Shady Drug... At first I intended it as a quick solution to both mind control and bind status, wile also actually giving the downed member some significant permanent stat boost (there's a reason why it cost quite a lot). Seems like there are also a couple of side effects huh... It lives up to its name...
If it's not breaking anything then I'd rather not tinker with anything regarding this item though. It might break something else down the way.
Also, Metal Tower V1 is intentionally skippable, as its only reason is to recruit a secret cameo character, as well as triggering the first flag for the game's true ending. This one's not a bug.