Playing as doux of Karvuna (gavelkind succession), my wife inherits the duchy of Dalmatia as well as the county of Split. All is well until my second son is born, strangely my first son, who was to inherit the duchy and county of Karvuna, is set to inherit my wife's holdings and the younger brother becomes my new heir. Changing to primogeniture had no effect on succession. While this didn't break my game it did irritate me enough to quit playing my session. Has anyone experienced something like this?