If its a regular edition and you didn't mod it its not modded.

I can't think why this isn't working. The valour bonuses should add together. If you build a master level building in some other province that doesn't give any valour bonuses, does that give a v1 upgrade?

maybe you could download the v1.1 patch, though I didn't hear anyone say that there was a problem with master buildings in v1.0.