Possible bug

[Moonlit Knight]

This may have also been the case in Warlords and I never noticed it, but if you have a Corn resource next to the river it automatically gives you three food. Hovering over it advises that if you farm it you get +2 food. However if you do farm it you actually end up getting +3 food.

So there is either a bug with it giving too much food, or a bug in the information field of the tile.

 

[namliaM]

A farm will give +2 food.... Irrigation of said farm adds another food.

Not a bug...