A little bit similar in that I think this is a port type issue - I'm playing as the Allies against the computer Axis, and the red marked hexes keep reverting to Axis control when I vacate them. [I move thru them to convert them to Allied ownership, then next turn they are Axis again, and no Axis unit moved thru them]. I suspect this is due to the port, but the port is actually in the blue marked hex, so it doesn't seem right. 
 
 I also noticed this in my last two games as the Axis playing against the Allied computer - when the Allies are landing in Normandy/Brittany, they can attack naval units that are in ports that are not Allied controlled. It seems like, in order to attack a ship in port, the attacker should have to occupy the port itself, not an adjacent hex.
 
 
