reCaptcha Checked but getting invalid response

I am using EasySocial and EasyDiscuss on my website. Using EasySocial for registering. When I click that the recaptcha code is a mandatory field, I can register, hit the "I am not a robot" the checkmark turns green but I get an invalid reCaptcha response.

I currently have it as a non-mandatory entry...

I have included my information below