IMU (accelerometer) calibration

Whem I am doing accelerometer calibration with PixHawk2 PX4 V.1.11.0 version and I cannot get both IMU.xacc AND IMY.yacc around 0.0x - see pic below:

Capture du 2020-09-14 11-37-37

I would like to as ask whether it is a normal behavior or not? If not is there any mean/hint to improve the imu calibration?

Thank you