Supply Ship Bug

When navy supply groups pick up extra supply ships to carry supplies to fleets, they do not get rid of the supply ships when they are done. They just stay with the supply group and cause them to bloat in size.

Can anyone tell me why my supply units and supply fleets are not giving my units or fleets the supplies they need but I have them in stock I want to move some of my fleets near my Rome state of Egyptt just incase Izzy skyliner does invade one of my states/country's but my fleets and supply fleets say they are out of gassalen but I have it in stock