Could you please provide your ZPL code? Also it worth to perform a following SGD command and share complete result here:
! U1 getvar "allcv"
Here is information on how to capture report properly:
Also you may find this response useful:
Software Engineer, Kutir Mobility
Posted on behalf of Zebra Technologies
Make sure that the media type is set proper on the ZQ320 printer. You can do that with the following SGD.
! U1 getvar "media"
Make sure that the media.type is set to "journal" instead of "label" if you are not using label media. In addition, check the setting of the zpl.label_length. If zpl.label_length is not set properly, you would see a big gap between the prints. The following two examples do the checking and setting.
! U1 getvar "zpl.label_length" ! U1 setvar "zpl.label_length" "150"