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Is the focuser a rack and pinion or a Crayford type? If it is a crayford style and you run it "past" 0 on the focuser scale the focuser will slip and your step count looses it's reference point.
I think from memory you can reverse the focuser direction in the software? (I have never had my hands on a Sesto Senso but If so, set it so that position 0 is with the focuser fully racked in, it is usually easier to visualise that way, a bigger number racks the focuser out further. Given you can manually focus with a Sesto Senso still attached it makes calibrating easier too, you can just rack the focuser in all the way then in the software, set it to 0 steps.
If you have a rack and pinion focuser then the step count should not change unless the focus motor actually slips on the drive shaft under power, or you move it manually with the power off.
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