FMB Problem: AI no longer fighting

[Racetrack]

I'm making some custom mission with the FMB but i have an huge problem.
Everything work fine! Triggers too. But in the middle of any battle the AI fighter stops the dogfight and start to go around in close formation, they don't give that they are under attack, they just go around in formation. Why?
How can i let they fight unitl the last enemy is down?
Cause is very annoying this... At first i was like... BUT THEN..
AHAHA