You can also get this effect if an ally builds a Starbase at your planets and you rotate your orbital structures on top of his Starbase. The problem comes from the fact that you can't rotate allied structures.
On this issue, I'd like to say that from a Gameplay perspective it would be awesome if we could rotate structures of players we have a synergy pact with. Having a TEC player on support with double fortress and a Transcencia in the middle would be awesome!
