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.
In the phpdocx folder there is a folder named templates.
In the templates folder is a file named phpdocxBaseTemplate.docx
I opened this file, looked at the "Normal" style and discovered it had 10pt after paragraph and Mixed 1.15 line spacing.
When I changed this file to have 0pt after and Single line spacing, all my troubles vanished.