Thanks I just sent an email.
I get that I might be the only one with the problem, but apparently there is an incompatibility when I use the code shortcode. I tried using one of the default wordpress theme and disabling literrally all of the plugins besides this one. and I still get the same results. Nothing after a shortcode (Builtin inside wordpress) is transfered in the PDF. So There is most defenetly something wrong in your plugin.
What do you mean by customization ? Also, everything else after a piece of code does not show up in the pdf. Same for the featured post image.