Recently I've seen in a game that an AI player has been able to build 2 starbases very near each other, within the restricted build radius. When I've tried to build starbses I have not been allowed to build them within 3 squares of any others (there must be 3 empty squares between them).
I have seen the Arceans, have 2 starbases placed near each other. They were an influence starbse and only 3 (2 empty squares between them) squares away was an economic one?
Is there a tech or improvement that allows this to occur? Or is this a bug?