I've copied the Recaptcha Custom Control into our application and have entered our personal public/private keys in the properties of the Custom Control. The captcha is displaying properly in the browser.

The problem we're having is that when an incorrect captcha is entered the form is submitted and processes successfully. A message doesn't appear inside the captcha like it should.
The XPage is running on a server with Domino 8.5.3.

I'd be very grateful for any help you can offer. This is a very useful control that we would like to use on our website.