Suito calibration - different offset values every time

[pfarid]

Hi

I’m using suito - it’s a freshly bought unit .
Every time I perform a spin down calibration I get different numbers for offset . they can differ from each other by as much as 300 . The calibrations are perform one after another, a few seconds apart.
The number on the case says 9062. However some readings can show 9663 , other are closer to 9300 .
I’m doing the calibration by the book - 10 min warmup , then I follow the instructions from the app

My firmware is up to date.

Is it ok that they differ by that much ?

What would be the best app for calibration -
Zwift , the native elite app , trainerroad ?

Br
PF