Arduplane firmware version 4.0.3 buggy

i recently installed Arduplane firmare 4.0.3 on pixhawk 2.0 using Mission planner 1.3.70.
I set the parameters for auto mode but as soon as i switch my Vtail plane to auto mode, the nose gear shifts to 300pwm. It yaws while taking off and even flipped over once due to this.

Can this be due to buggy arduplane firmware version? Because i’ve rechecked the parameters several times and there seems to be no issue.

Try to share a log so devs can check it.

in this flight it luckily did not flip over

this one flipped over before taking off because it yawed too much with 100% throttle just before takeoff