Hello,
We have run your code using phpdocx 9.0 and 9.5 (classic and namespaces packages) with PHP 5.6, 7.0, 7.2 and 7.3 and in all cases all contents are generated in the DOCX. There's no missing contents setting or not 33% as width. Please check your server logs, maybe there's any warning or error?
Anyway, we always recommend setting all widths to get a correct output, most DOCX readers can't handle auto values correctly (https://www.phpdocx.com/documentation/cookbook/convert-html-to-wordDefining widths in tables section).
Regards.