The campaign has to be broken, at least on steam?
I just restarted the campaign, and flew the first mission where you have to fly around the area. I landed and quit the mission, getting a 50% completion rating, weird? I go on, and the next mission wants me to fly from the northern part of the map down to kutaisi (?) and about 100 meters from touching down I get a missions succes text in the top screen. I land and park my aircraft, and quit the mission.
Then I'm greeted with a campaign failure screen, and the campaign says I've been defeated.