OK, so my client finally decided to use another forms plugin and it works correctly, so we are finally not digging about the compatibility issue.
Still, I let you the shortcode used in one of those pages in case you want to find out the mistake and fix the (possible) bug:
[easy_form style="none" submit="Reservation successfully sent." subsubmit="Thanks for booking" credit="Reservation complete" subcredit="You'll receive an email with the reservations details, in case you haven't receive conformation email, please check your SPAM" resourcename="Tour" price="1" pers="1" resource="261" multiple="popup" validate="Reservation successfully verified" subvalidate="Either make additional reservations or submit"]
The page was nearly blank and showed in console a 500 error.
PHP error found when accessing was:
[03-Aug-2018 20:27:01 Europe/Madrid] PHP Recoverable fatal error: Object of class WP_Post could not be converted to string in /home2/site/public_html/wp-includes/formatting.php on line 1045
Thank you so much for your attention
