Why do Sauridian ships attack me?

I'm playing the Sauridian string of E3, and every mission I get to attack the enemy, either the Sauridian ships that are my assigned escorts, or the ships I am helping attack me! One mission I hypered in and before I could fire on the enemy, I was attacked by my escorts (assigned escorts). This happens in each and every battle I'm in. I have to use my targeting button (tab key) instead of the closest hostile button (alt key) to target the enemy.

~Tim ^_-

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"Hanging is too good for a man who makes puns; he should be drawn and quoted." --Fred Allen