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To fill out on what Jon has written, if the maximum number of steps you have set would rack the focuser past the fully racked out position, being a crayford style it will slip once the end stop is reached, until the focus motor stops moving. That would effectively move the "0" point.
You probably do not need the focus motor to run all the way to the out travel limit, if for instance your gear is in focus racked 20mm out from fully "In" then you can probably set the step limit to stop it perhaps 5mm further out than that. But you should certainly have it stop a few mm before the "Out" limit of the drawtube. If it was a rack and pinion I would say keep it from quite reaching either physical stop to be sure it can not try to drive it into a hard stop.
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