Haven’t used them for years but don’r recall having this issue before.
If I fit expanded cargoholds onto a ship I am unable to access the additional space unless I make it the active ship. So, if I am in another ship docked up I am unable to transfer more than the normal capacity into the industrial sitting in the ship hanger. If however I make it the active ship I can tranfer the cargo into it with no issues. If I then move back into the original ship and interrogate the cargohold of the industrial the cargo is all there but only apparently occupying the basic cargo capacity.