my form fields have duplicated 10 times

Hello,
Since I installed Material Design CF7, my form fields have duplicated 10 times, why?
Here is my test page: 
https://auto-motors-services.fr/contact-2/

Thank you for helping me.

Here is the code of "Contact Form 7":
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[text* your-name placeholder "Nom"]
[text* your-prenom placeholder "Prénom"]
[text text-252 placeholder "Adresse"]
[text text-27 placeholder "Code postal"] [text text-28 placeholder "Ville"]
[tel tel-46 placeholder "Téléphone"]
Email : [email* your-email]
Service souhaité : [select* Servicesouhait "" "Révision" "Réparation" "Vidange(s) et Filtre(s)" "Autres"]
Objet : [text your-subject]
Votre demande : [textarea your-message]
[text text-147 "Joindre un fichier, formats : png, jpg, jpeg et pdf ?"]
[file file-217 limit:7MB filetypes:png|jpg|jpeg|et|pdf|]
[acceptance acceptance-363] J'accepte que les informations saisies soient exploitées dans le cadre de cette demande de contact. [/acceptance]
[submit "Envoyer"]
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Cordially
Roberto

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