Hola Miguel!
I’m really sorry to hear that. I can truly understand your frustration with this issue.
I made a closer inspection in the child theme files and I could find the conflicting code that is causing the community submit form to break. It seems the jb_shortcode_unautop() function in the themes-shortcodes.php file located at /wp-content/themes/directory-4x/includes/ is being added to ‘the_content’ filter, causing the addition of <p> tags and </br> tags in the document, mixing them up with Javascript code, thus breaking it.
By removing line 68 of that file
add_filter( 'the_content', 'jb_shortcode_unautop',100 );
I could make the form work correctly.
I’m not really sure if removing that line can cause other issues with other parts of the theme, so I’d suggest you get in touch with the child theme authors to let them know about this and see if they can give you some insight about it.
I hope you can get this issue solved. Let me know if there’s anything else we can help you with.
Best,
Victor