Erroneous statistics for growth on load

This is a very common glitch, not just with Fortresses.

My games never crash, however, so I don't think there's a connection.

I think the crashing is only relevant because it makes him have to load games.  It's the loading of the games that causes the erroneous growth amounts.  

I've noticed that if a city runs out of food, and growth goes to 0, when the city finally has enough food to continue growing, the growth number doesn't change until the next turn.  That may be related.