The issue with your lab scanning kit stage not returning to the home position might be due to not resetting the stage to the zero position before powering down. As a result, the stage has now set the last position as its new zero. To resolve this, the stage should be set at the zero home position in the software before stage is powered down, then disconnect the power from the motor, wait for a few seconds, and then power it up again. This should reset the stage to zero and restore normal operation.