Can someone address what the A.I. is doing on my custom map?

https://i.imgur.com/Wfjgfq5.png

The yellow and pink are both Titan Ai. Despite there being plenty of resources on their side of the map they flock to the TOWNCENTERS of red and green. They build around the starting towncenters as if they were their own, and begin hunting their food. Any Ai in white/red/blue/green works fine. But the 2 up north won't start unless they can get to red/green towncenters.