Alliance problem

Description

I've started game with two human controlled Empires. Created aliance. Then I've started new game, just from menu during game. Created new game with two human-controlled empires. And then I found some interesting thing - this empires wasn't in alliance at that time, but they shared system maps and technologies! That was treaty in alliance in previous game! But they don't share radars and communication channels. When they actually meet each other and tried to form new alliance - it wasn't formed! At least was no visibility of it, but they was still recieving bonuses from alliance treaties.