I'm aware that the majority of debuffs last 3 turns. From my experience, this is rarely the case for curse. I have a lich who I use Curse 3 with a lot but after a while I kinda stopped because even if it procced I'd noticed it ends as soon as the cursed target get their turns - sometimes it doesn't. I have no idea if this is a bug, or if anyone has experienced this, or if this is an intentional counterbalance because curse can be so strong. There feels like there is something unexplained at play that determines the duration, despite it being my favorite status to impose aside from charm, it's extra crit chance is just rarely reliable to stick to without knowing the variables.

Quick edit: Of course, I am playing Reborn.