We played our first game of China last week and decided to use the optional fortification rule.
I noticed the directions indicated the game included 5 fortifications, even though my copy has 6. Anyway, that got me to thinking that maybe each player was supposed to have one fortification to use whenever he or she wished to place it. I know this is reading something into the rules that was not there, but we played that way and it seemed to work okay.
Was this incorrect? Or can a single player place more than one fortification? This would seem to allow a player to have more than one fortification in an area or in a long road and the rules don't cover that possibility either.
My recently purchased copy also had one extra fortification. When I counted all of the other pieces, one green house was missing. So you may want to double check as well. The good news is that I e-mailed Ueberplay and had a replacement within a week.