I have this same issue. The mod works fine mechanically, but it appears that all the cultures and religions are screwed up. Jain and Buddhist-labeled sea provinces, Francs ruling random kingdoms, etc.It's been a while since I've played this mod. I've tried both the official and SVN builds and I'm wondering, why is the head of the SPQR a Czech?
Why do Occitanians rule random English and Slavic duchies?
Why do rulers cultures and religions seem to frequently mismatch their lands?
Is this WAD or some sought of problem on my end. I'm using the BLC sub-mod in both cases.
I tried disabling Rajas, but that didn't help. It has something to do with the patch.