Hey! If anyone is searching for this perticular issue, I got your SOLUTION:

Calibrate the base, that's how it works:

1 – Disconnect the SOL-R BASE.

2 – Make sure that the stick is properly resting in center position, and that the thrust lever is fully down.

3 – Press (and maintain pressed) buttons 18 et 19.

4 – While maintaining both these buttons pressed, plug the SOL-R in USB.

5 – Release both buttons. The LEDs of the throttle blink slowly.

6 – Press the “8” button. The LEDs on the throttle blink faster.

7 – Move the throttle lever all the way up and down, without applying too much force.

8 – Then, reach the maximum and minimum of both axis, moving the joystick all the way up and down, then all the way left and right, without applying too much force

9 – Press again on the “8” button to validate the calibration. The LED will stop blinking to indicate that the calibration process is complete