Noble Titles WON'T stop reverting

So I just recently got Royalty & Legacy; I play with no mods or CC. As my sim has been moving up in the noble rank, I've noticed that neither he nor his spouse's or child's noble titles are changing. When you hover over their pictures on the bottom left, they're always Knight, Dame, and Lord. My sim is a level 9 noble; they should be Grand Duke and Grand Duchess. Even in his career panel, it will show up incorrect. 

The only thing that changes it is when I physically go into the page where you can edit the noble titles (as if I'm changing them) and then just click the check mark, and that will usually change them to what they're supposed to be, but if I travel or really do anything, after a certain period of time they will just revert back to Knight and Dame both in the career panel and when you hover over their pictures. 

Anyone else having this problem? Or know how to fix it? I'm assuming it's just a bug and there's nothing I can do, but it's exhausting to put in so much work for your noble career, and your sim is perpetually considered a knight. It seems to only be happening with the titles; it doesn't seem that any of the actual gameplay is being impaired as he levels up in his career.