Questions about failure to change flight mode

Ask questions about issues you encounter first.
The aircraft I’m flying is flying a 900 class electric helicopter.
As for the firmware, the latest firmware 4.07 is installed.
If you change to Loiter mode while in a stabilized flight, the mode cannot be changed.
The same thing happens if I retry the compass calibration and all calibrations.
This is the first time I’ve seen this phenomenon, so I don’t know what’s causing it.
Please help.
I will also upload the parameters of my helicopter.
Thank you everyone.

Y.S Kim