i'm new to CK2 and i get confused a lot.
I started as Earl of Ulster, and before my initial Earl died, i changed succession law to 'elective'. I made my daughter elected (barely - some mayor almost got elected instead). A bit later she was able to claim the title of Duchess of Ulster.
But then i notices my succession law is Gavelkind. I said to myself 'this is probably how it works', and continued playing. But then i noticed popups about who supports who continue to happen! And they talk about County of Ulster, not Duchy: http://i.imgur.com/Y82J2.jpg
Is this a bug? Or am i misssing something here?