Accents not working in spanish website

Hi,

I’m trying your plugin for a spanish site and I have a pdf button at the bottom of posts to print them.
The problem is that whenever I try to make a pdf out of a post it seems to glitch and shows weird characters wherever there should be an accent in the text.

Link to a post to exemplify:

https://abogadosmarinaespina.com/division-judicial-de-la-herencia-cuando-no-hay-acuerdo-ente-herederos/

Check the first word in the title for the pdf(button at the bottom) and compare to the post.

Any ideas of where that may come from?

Excuse my english.

Thank you for your help.

P.S.:

Your forms in:
https://wpswings.com/submit-query/
https://wpswings.com/contact-us/
do not work.

The page I need help with: [log in to see the link]