Playing against the AI and landing on another planet, units will not automatically return fire against the AI units. Only when we specifically target a unit, will our own units fire on that one unit but no others. This had occurred on 3 separate games now. 2 games with 2 v AI and the other with 3 v AI. Units will automatically return fire on starting planet but not on other planets we attempt to conquer. Is this a known bug or is there something we are not aware of ?