Style Not Applying properly.?!

Hi @darkcod3r,

Thank you for using our postx plugin. Just now I have checked heading style 16. I can see it works fine. See the screenshot https://prnt.sc/12v7d2o.

Note: Maybe your theme contains a few special CSS for the heading tag.

Hello,
It seems that your heading issue is solved in single page.
Screenshot: https://imgur.com/a/Bvt5sjz
Thank you so much.