Choker41,
As you figured out, if an auto ack is within a certain range of the map room, the troops are “killed” and they disappear. Since you were doing the filming and they where your troops, you got to see what really happens behind the scenes. The troops go invisible, have their country bits flipped to the country that owns the field, and then continue to run to the map room. (At least that is my theory.) The fact that the troops you dropped remain visible in your film is the real bug – unless that is the way the film viewer was designed. You noticed that Duhasst’s troops behaved as expected and just disappeared in your film. Had he been filming, his film may have shown his troops changed countries too.