What Happened to my Butler?? Need Help Please.

I've had this problem as well. I finally had the perfect butler, and three times now he's just been replaced without warning. So. I go into manage worlds, add him to the new butler's household, then delete the new butler.

When I go back to my save, my preferred butler is back in place. Oh, and my butler now has like §100,000 for all the times I've combined his household.