multi city captain


When using the Captain to farm resources with multiple cities I've just noticed that the amount of resources supposed to be added to the city doesn't seem to go there.
At the bottom of the captains dialogue box it shows the total resources that ought to be in the warehouse of the highlighted city after clicking demand ie total = existing + amount demanded. However unless you're actually "in" that city at the time the resources do not go up to the total shown but the total shown in the captains' dialogue box actually falls by the amount demanded but the total in the city where the resources are supposed to go actually remains unchanged. So does anybody know anything about this?