In my game as Germany, something strange happens. Every turn I get one or two of the cities that want to join another empire. Oddly, that empire has no culture in that city. I get a message along the lines of "the people of Colonge rightfully ask to join the Sumerian empire". And then I'm given a choice to agree, disagree or view the city (obviously I tell them no way). It happens to every city exept the capital (yet! - the game is running). Even cities that I founded myself and are nowhere near anyone else and still the people ask to join another empire. I haven't found any adverse effects but its really strange. Does anyone else have this? Sounds to me like a bug (since the other empire has no culture in the cities).