Hello!
I was notified I should make a bug report here instead of the Github, so here I am.
I'm noticing an issue with some of the files for cultures that split into various sub cultures, specifically noticed this for Mongol and German cultures, but IDK if it's an issue for any similarly splitting culture. No matter where they are, the heirs and wives of the Mongols automatically become Astrakhani, whereas the Germans become Alsatian. I have an example history files attached, one for Germans and the other for Mongols. Let me know if you need any other files to help!