Dear Nick,
Please provide a screenshot of the print preview with all options you set to print and a printed invoice to review the issue to assist.
You can send links of the images by uploading them to your server.
Moreover, still, we didn’t get any objection about printing. You can check this forum, you will not get any related issues.
Furthermore, please learn more about the Envato Market (codecanyon) item support policy (item support includes & not includes), here https://codecanyon.net/page/item_support_policy
Best Regards,
ThemeLooks Support Team