Warning text when using form

When using the contact form on a page, there is a warning message which is displayed after publishing the page with the contact form on it (link to page posted with message).

To include the contact form on the page, I’ve just used the prescribed shortcode once the form has been created.

This warning message is then displayed on the page above the contact form and I cannot find what the problem is to address it.

Wordpress and plugin updated and have also tried re-creating the page and a new contact form, but the same problem occurs.

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