I was playing on the map Triumvirate and made alliances with all but one player (All AI mediums) and came to a point where the most logical choice of who to betray was the player right next to me which I started the game as allies with. I selected Go To War and attacked his planets one by one until only his home was left and throughout this time and while I was bombing his home he was offering trade, cease fire, and Ship vision. This most likely has to do with how the AI is a work in progress, but thought I should report it.