In my current game, I'm going down the Benevolent tree, and when I used this buff it was placed almost next to its star, outside of my home system. However, when I reached the Class 16 planet, that was placed quite distant from its star (which conveniently was my home system). I agree that it should try to be closer in, but maybe its tracking how much clutter there is and trying to space things out when it draws the new planets.
