Shortcode issue

Hello !

WC Captcha works fine with my login form, but I have an issue with this page : https://blog.ac-lyon.fr/formulaire-de-contact/

The shortcode does not work.

Please help.

Thanks in advance.

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