Please join my thread to document how status effects are supposed to interact:
Right now it’s not documented. So nobody can tell you if this is a bug or it isn’t except the devs. And since we don’t have proof there’s even “an intended order”, we can’t be sure their answer yesterday and their answer today will be the same.
Basically: instead of “all status effects applied at once”, the status effects are applied one by one in an undocumented order. So everything after Curse might apply, or if Curse then Stun is applied more things are applied.
But since it’s not documented, any patch could change the order without making it a bug.