Hello,
You may need to apply a character style to the link content to generate the PDF link correctly using the conversion plugin based on LibreOffice. Please check the documentation available on https://www.phpdocx.com/faqs/forum/default/topic/2012. phpdocx 11 adds a custom character style to links automatically, but previous versions require adding them using the wordStyles option.
If you send to contact[at]phpdocx.com a DOCX sample we'll check it. As your username doesn't have a license tied, also please send the username or email of the user that purchased the license you are using.
Regards.