json error

Hi

I’ve taken over a site for a client and trying to unravel what has been done before. Forms on the site (https://vervecycling.com) use Contact Form 7 but despite validating them, don’t send.

I get a

JSON Parse error: Unrecognized token ‘<‘

error underneath the form but can’t work out whether this is an error with the set up of Contact Form 7 or something else..

Any thoughts welcome,

Pete