Hi,
there is a Javascript problem on the page.
I'm not sure where it exactly comes from.
Usually the Javascript error message which is shown, when a user enters an invalid e-mail address in a field of type email, the Javascript error message would be
"Please enter a valid email: <br /><span>E.g. yourname@domain.com</span>"
This text is rendered in ONE LINE in the html source code of the website.
On your website the text is rendered in two lines
"Please enter a valid email: <br />
<span>E.g. yourname@domain.com</span>"
This causes a severe Javascript error.
I do not know, why the text is displayed in two lines on your website and I think that this is the result of another extension or some code that is run by your template.
It is the same problem with the error message for fields of type url, which is rendered in two lines on your website.
"Please enter a valid url: <br />
<span>E.g.
www.domain.com
"
Best way to fix it would be to find out, who is modifying the source code.
Alternatively you could fix the problem by creating language overrides (using the Joomla! language manager). I think that removing the <br /> in the texts would solve the problem. As far as I can see it would be enough to create overrides for the language tags COM_VISFORMS_ENTER_VALID_EMAIL and COM_VISFORMS_ENTER_VALID_URL for the English language on the "site".
Please use the console of your browser in order to check, it the Javascript errors are fixed afterwards.
Regards,
Aicha