Elementor form not always sending mails

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On this web site I am using Elementor and Elementor Pro.
On the contact page, there is a contact form that should send mail for any new submission from potential customer.

Unfortunately, the form does not send a mail for all submissions, but only for part of them.
I still can see all the submissions under "Elementor->Submissions" in the control panel.

How can I fix it?

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

 

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