Possible bug in fleet view. Upgraded a ship while it was on the way and when it arrived i used fleet view to send it to the next trip but its capacity didnt increase in fleet view or in active use(aka it still transferred the "old capacity" though in your ships it showed in the new capacity.
I refreshed the game and then it updated... i assume that had i gone to city view after it had returned it would have also triggered the upgrade.
Not exactly game breaking as it will correct itself pretty soon but maybe worth to fix if it always happened and isnt just specific to my case/or ship.
Oh yeah was using PC version.