Hi there,
I am not sure whether this is a bug or not, since this is the first game I am playing with the rather new cargo feature.
It happens to me in the North America Challenge.
I am serving the route MUHA-MUCC, which has 0 kg/day cargo demand.
However, the return leg, MUCC-MUHA, shows about 210 kg/day cargo demand.
Same goes for the MUHA-KMIA-MUHA route. (inbound KMIA: 0 kg/day , outbound KMIA: 270 kg/day)
Are these unbalanced supplies intentional?