Thank you very much for choosing our theme and for contacting us.
Please make the full backup of your site as well as the Theme settings export and check the issue on the Storefront theme to detect if our theme causes the problem. Storefront is a free theme developed by Woocommerce.
It means that the problem is not caused by our theme.
Please check the mail tab in most cases the error is connected with the wrong mail format: https://prnt.sc/uivhcu
Just create a new form and copy the line from that new form into your existing. If it does not help, refer to the contact plugin documentation or support.
Also, make sure your server mails is configured correctly with the support of your host.