Radio setup, dot cursor does not reach to the end of the bar

hardware: PIXHAWK MINI
firmware: PX4
GC: QGroundControl v3.1.3
Transmitter: Futaba 10J

Hi, folks.

I’ve been trying to calibrate my transmitter in Radio setup menu of QGC.

However, even I fully move up and move down the throttle stick of my transmitter, the dot cursor (slider? indicater?) on the screen does not reach to the high end and low end of the bar. This unmatch occurs not only for the throttle stick but also other sticks too. In the video of " AUTOPILOT CONFIGURATION" page below, the dot cursor reaches to the end of the bar.
(from 4:45)

Could anybody kindly tell me the reason my transmitter does not work like this video?


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