Greetings,
All fields, Towns, Strat Targets, and Ports may be rotated. (obviously, Ports will rotate to be on the water

) I did ask this question in the Terrain Forum - Mr. Skuzzy did provide an answer.
It just depends on whether the map builder wants to take the default facing or play around with it. I would guess the some map builders in the past didn't take the time to rotate the maps for whatever reason.
I do not believe the clip board icons have a relationship to how the field actually runs on the ground.
Regards,