someone has poor trigger control.
you anticipating recoil and forcing the muzzle down as you jerk the trigger?
It should be a smooth "press" on the trigger all the way thru while focusing on the front sight.
Don't forget the "follow through" after the shot too
you mashing the shutter button on that camera with your elbow?
or is that porty moving at 20 mph.....
..L.T.A.