Started game on normal - Iron man. Right at start before tracking any UFO's I sent out the chinook to see how long range it has and soon after, a ground combat started. I finished it and a second started.
Quit the game and started anew and the same thing happend. Not even a UFO discovered window popped up before the GC started. If there was a UFO there for real then shouldn't they try to shoot down the chinook? But I guess it's a bug since no "UFO discovered window" popped up.