Stationed fleet using up supplies of a distant state

[Kryndude]

Why is it using supplies from that state among the four...

 

[Kryndude]

I tried moving the fleet completely out of the sea region, sent in my tanks and some more infantry, moved the fleet back in, and now it's using supplies from the upper right state. I guess once a fleet registers a "home state" it doesn't change until existing the sea region.