Please note this is an old forum thread. Information in this post may be out-to-date and/or erroneous.
Every phpdocx version includes new features and improvements. Previously unsupported features may have been added to newer releases, or past issues may have been corrected.
Thanks to the amazing support team at phpDox I've got a solution.
The problem was caused because my template document was generated from LibreOffice. When I switch to a template generated in Word the problem goes away.