Any ideas for this error?

So my longstanding issue is that starting in the bookmark of Aegon's Conquest, the Night's Watch breaks and the landed titles don't follow the NW succession. They instead go to the brother, or one of the nephew(s) of Lord Commander Harras, Harren the Black, King of the Iron Islands. If have finally figured out after long last WHEN this occurs. It is only if Orbert "The Black Centaur" is the nominee for the next Lord Commander. If it is another Black Brother, there is no issue.

So my question is: what about Orbert is fucking up the succession so badly and where in the mod files can I fix this? Could it be some oversight in making his character?

Edit, turns out it was the fact I made him a commander. So if the nominee for LC is a landed (i.e. appointed) black brother, it doesn't work right. Only if the brother is normal and unlanded, will it work...