Inconsistent accels

Using firmware 4.1.1
Calibrated Cube black multiple times but still getting error “PreArm : Accels Inconsistent” enabled Tuning checkbox on the Data Page and this is what I got from az,az2,az3
I am moving the frame in z direction

And this is when the frame is kept stable on the bench
2nd Accel Z axis values are a bit offset from the other 2 accels
Is that normal? or is the IMU bad ?

This is normal because one of them sits on FMU board while others sit on isolated IMU board.

Please try to calibrate after the Cube is fully heated up. By default target temperature should be 45 degree Celsius.