Hello,
What version and license of phpdocx are you using?
The problem is that almost all contents are being added using absolute positions. The DOCX, that has not been generated with phpdocx but with other DOCX program, contains one table and multiple textboxes positioned using absolute positions.
As recommended on the documentation pages (https://www.phpdocx.com/documentation/conversion-plugin/preparing-the-templates-for-its-conversion):
Avoid to the greatest extent possible using absolute positions and place the contents in the document with elements like tables.
As this is a DOCX to be used as template and then transform it to PDF, we recommend you to generate it again without using aboslute positions or use LibreOffice to generate it.
Regards.