Overall bug.

Don't know if you guys have heard of it yet, probably yes, but still.

I am playing as the Romani faction, and it's going pretty well. Destroyed Epeiros and conquered all cities from Patavium up to Thermon.

Strangely however, every time I notice that all my Government buildings are broken (EG: Italian Government, Romanized Province, etc)

Is it just me, or is this bug common?

This will happen if you play two different factions without exiting out of RTW. In order to prevent this, if you are going to play one faction then switch to a different campaign as a different faction, exit out of RTW and restart the game first.