Su-27 Campaign AI uncooperative

Noticed that, in the stock campaign, when my flight has 4 members, nr 2 will listen to orders and engage when asked, but 3 and 4 just hang back behind me and refuse attack orders, being general wastes of space. They only really do something after I engage myself, but as you can guess I would rather send them in first or at least at the same time, but no, they always hang back behind. Anyone notice it? Is this a bug?

I've noticed this on occasion, but not only in campaign missions - it also happens in single missions that I've made. I've only seen it myself in 2.0 alpha though, not 1.5 beta or the stable version, though it could be happening there as well and I haven't noticed.