＜The causes frequently observed>
(1) Improper loading of the label
(2) Dirt such as adhesive or piece of label on the label route
< Measure >
(1) Please refer the below link and reload the label accordingly.
CL4NX/CL6NX Plus: How to set and reload the media (label and ribbon):
(2) Please clean inside of the printer particularly the media route.
For CL4NX/CL6NX Plus: Cleaning method:
Please also refer to the below link for adjusting a vertical printing position.
For Print position adjustment: