The contact form keeps sending new mails from one and the same request

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Dear Community,

We are using the contact form from the Lite version and since Saturday the form keeps sending new entries from one and the same request, but with a different number, to our server. We receive these mails and unfortunately so does our customer. There are now 10 mails.
After consultation with my hoster, all messages come via PHPMailer directly from WordPress from the file ……../wp-includes/PHPMailer/PHPMailer.php.
An error from the server has already been ruled out.

What could be the reason for this?

Thank you very much
Tanja

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

 

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