Cube orange with herelink

Hello Everyone.

I have been setting up herelink with cube orange. runs firmware Arducopter 4.0.3 stable
I have done all the basic parameter setup.
assigned modes On Qgcs in herelink.
While in altitude hold, after arming, the throttle keeps on increasing.
The disarming command is not working when the problem arises.
Don’t know What leads to this problem.