Quote Originally Posted by GunksFoy View Post
Statuses that can be removed have a white line over them in the Party Menu and your debuff bar. Additionally, I think antidotes only cure Poison, while you may have been inflicted with something that looked like Poison. Not 100% though. You're honestly better off using your role skill that cleanses (Erase).
Just a visual for you. This be the white bar in question: