Print to pdf is some time blurry

Printing to physical paper or to pdf is blurry in some cases. Same data is printing perfectly fine using google chrome.
It can be easily seen with Qt Example PrintMe.
Just replace setUrl with this:
https://dev.mdxperience.com/pub/Superbill%20View.htm

and then print it on paper or to pdf. final result is not clear and looks blurry.
Attached is the output when done throug Qt and when done throu google chrome