Legendary lord not respawning

I'm doing a Settra campaign and managed to make Repanse into a sack city to farm her lord trait but she's stopped showing up. I beat her twice to get her onto the little island but its been 30 turns and she hasn't respanwed. Funnily enough, she hired gotrek and I managed to get unbreakable on Settra but Lyonesse hasn't hired a single lord character in like 30 turns. Is this a bug or am i doing something wrong.