I tried fixing this once but couldn't find the names for all the civs. Maybe I'll try it again. I'm also going to look into making a mod that brings the banners for the new civs into ROM. That's a bug. I don't remember what causes it but I think it has something to do with the "Start as Minors" option. I just did that for the Netherlands because I know that that place is marshy. I don't know exactly which terrain would be appropriate for those other areas. Maybe just plains? News to me. Are you sure it isn't a modmod that does this?