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Where on the site do you have the form having the issue?

hi, thank you for your answer, here is a link but several forms regularly cause problems:

https://www.coudekerque-emploi.fr/poste/ville-de-coudekerque-branche-coudekerque-branche-179-conseillere-en-economie-sociale-ou-familiale-h-f/

What other plugins and theme do you use on the site?

hi,

just the theme: Jobseek Version: 2.2.4

and plugins: Advanced Access Manager, WP Job Manager – Favorites, WPBakery Page Builder, WP Job Manager Field Editor, WP Job Manager – Job Tags, WP Job Manager – Embeddable Job Widget, WP Job Manager – Company Profiles, WP Job Manager – Application Deadline, WP Job Manager – Alerts, WP Job Manager – indeed, WP Job Manager, WordPress Image Mapper, WooCommerce, Ultimate GDPR & CCPA, SSL Insecure Content Fixer, Sharify, Pods, One Click Demo Import, Nav Menu Roles, Loco Translate , Limit Login Attempts, Kirki Customizer Framework, Jetpack by WordPress.com, iThemes Security Pro, GA Google Analytics, Envato Market, Disable Comments, Contact Listing for WP Job Manager, Contact Form 7, Classic Editor, Change From Email, Akismet Anti- Spam, All in One SEO Pack,

Thanks for your help

Try switching to the default theme and deactivating all plugins excluding Contact Form 7, Akismet, Classic Editor, and WooCommerce.

Why you are advised to deactivate plugins and switch to the default theme.