Is EK3_IMU_MASK supposed to change from 1 to 3 after downloading parameters?

ArduPlane Plane 4.7
1

Running Arduplane 4.7.1 and I am noticing when I look/download my parameter file that EK3_IMU_MASK goes from 1 (which is what I know I set it to) then it changes to 3 (which shows in my downloaded parameter file). When I plug the aircraft in, it is back to 1 again. Is this normal? Also, will this be dangerous if it changes to 3 and I fly the craft?

Flight controller is HeeWing’s FX-405 which I believe only has one IMU.

2

Not sure why it’s switching. But 1 will be the first IMU, 3 would be the first and second imu. If there’s no second, it will just use the first.