In aces high, when the damage list shows flaps damaged, it indicates that the flap is jammed. In this case sounds like ur right flap was jammed at full (probably got hit in that position).
So now (one of the mot irritating features of the game) auto retract, retracts the left flap as speed builds up. And presto, the aircraft is no longer balanced and wants to roll left.
I really whish auto retract would be disabled, at least when 1 flap is jammed. Let em both be frozen at that position.