Losing a flap on the right side of the plane makes the plane bank left for some reason. This is highly unrealistic for two reasons:
1. I f you lose a flap on the right side On planes with plain flaps like the P51 and P47, you increase drag on the right side because of turbulent air that the edge of the wing will create.
2. On most planes with plain flaps you lose 1/3 of the wing when you lose a flap, so you also lose 1/3 of the lift on the right side.
Knowing that you would have more lift on the left wing and more drag on the right wing. This would make the plane roll right instead of left.
So, Basically if you lose a right wing the plane starts rolling right more.