Fighter Launch Bug? Can't break down into smaller Groups

[Bowden Russell]

How do I launch fighters in Groups of one or two from a planet (not a CV, I know how to do that). When my opponent attacked me he had one Mark IV cannon blow up a single group of 13 fighters with one shot. He had only one cannon so if I had the group broken up into smaller numbers the most he could have taken out was one or two fighters.

It seems that the fighters group themselves based upon how they were constructed.

Also, in combat or just before it begins in space, not in a planet, how do I break up the fighter Groups into smaller numbers?

Thanks,

Bowden Russell