The servo of AR WING can't get right trim value in arduplan 4.0

My ARWING can’t get the right trim pwm output in arduplane4.0,please see the attached pictures.all the sticks has put on center.but the servo output keep on lowest pwm value with trim at 1500,I flash the firmware back to arduplane3.9.9,it works fine now,I guess this an issue above firmware4.0