combat that don't make sense

[Pocus]

Hi,

I'm playing a solo game with sequential turns ON (I want to play the tac battles).

I saw twice the following behavior, so I think it means it is either a feature, or a bug:

a) I start the battle with some fighters in space, and some on the ground of my planet.
b) battle commence, I launch my fighters. The ones already in space fight
c) i loose my first wave fighters.
d) new turn, none of my second wave fighters exists any longer, and I can swear you they have not been hit.
e) combat ended.

I even replayed the turn, and I have the saved game. This do not make sense.