We have noticed that the barcode bar width in the BY tags multiplier is changing from time to time. For instance a barcode value of just the letter a in say code 128 for a BY value of say 4 is not staying the same size in width. Is there some setting or tag that can be sent to a Zebra printer that will change the width of the bars in the BY magnification? Can this program happen do to a particular calibration. This matters because people have to certify barcode widths for label standards and if they change it cause real problems like charge backs etc.