recapture only sometimes displays

I added recapture to a contact form 7 and it works on my home page. However, this is the only place it works on the site and doesnt work in any of the lightboxes or the dedicated contact page.

http://www.rupertvamp.co.uk
Password Temppassword1

http://www.rupertvamp.co.uk/contact-us

The contact form 7 that works on the home page is the same that does not work on the contact page.

https://wordpress.org/plugins/bwp-recaptcha/