[Aristoi]

I don't know about the range, but if you have ships in the square already, you'll have a 2 pronged attack. This causes the computer to make 2 sides for you alone. If you look you'll see that the first click of end turn moves you along to the second flag. Then you click it again to end the second.

It's a bug of some kind, but it isn't really that serious, I don't think.