Is the forward throttle 18 absolute position normal?

Not normal. According to public information, the normal range of throttle opening is between 1.6-5.0. When it is lower or higher than this value, it is necessary to adjust the throttle opening in time, usually by changing the length of the joystick, that is, let the throttle pedal rise until the throttle is closed, and then step on the throttle pedal to make the throttle fully open.