Loading button keeps spinning after sending form

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Hi,
I have a page my clients use to order a document.
There’s a CF7 form in this page.
This page has an API integrated to generate a document from another website once the form is validated. I don’t know if the problem has anything to do with that.
Everything works fine except that the spin keeps spinning after the validation button is clicked.
I can’t share this page here as, because of the API, the validation of the form creates and sends a document. if necessary i can’t share the page to a individual person.
I’ve tried to deactivate “Async Javascript” and “Autoptimize” but i still have the same problem

Here are all the plugins i have:

Ma configuration WP actuelle :
- Version de WordPress : 6.0.1
- Version de PHP/MySQL : 7.4.30 / 10.3.35
- Thème utilisé : My Child Theme. Child for GeneratePress.
- Extensions en place : Async JavaScript (2.21.08.31), Autocomplete Google Address (1.9.2), Autoptimize (3.1.1.1), CF7 Google Sheet Connector (5.0.0), Contact Form 7 (5.6.2), Contextual Related Posts (3.2.3), Cookie Notice & Compliance for GDPR / CCPA (2.3.1), Forum_wordpress_fr (4.2), Header and Footer Scripts (2.2.1), miniOrange 2 Factor Authentication (5.5.82), Pricing Table by Supsystic (1.9.7), Redirection (5.3.2), UpdraftPlus - Backup/Restore (1.22.14), Wordfence Security (7.6.0), WP-Members (3.4.4.2), WP Content Copy Protection & No Right Click (premium) (13.2), WP Super Cache (1.7.9), Yoast SEO (19.5.1)
- Adresse du site : 
- Nom de l'hébergeur : Apache

Could you please help me?
Thank you
Mathieu

 

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