Radio Calibration. no reach maximum and minimum

Hi all.
I’m making quadcopter using F450Frame and Pixhawk2 Cube.
and Firmware is PX4.
Every step was done well. but I met some problem in radio calibration.
I followed step of radio calibration by manual and completed calibration.
but In QGC program, gauge of each channel did not reach to minimum and maxmum.
is this nomal? Im not sure that calibration was done.
how can I do radio calibration that reach to minimum and maximum gauge?
i hope to recieve good idea. thank you
my RC Controller is Futaba T16SZ

Nothing wrong there.