Topic closed:
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.
I found the solution.
The problem is when adding WordFragment with $target = defaultHeader. I replaced the target to "firstHeader" and it solved the problem.