Contact Form 7 reCAPTCHA Extension – Input error: Invalid referer

Hello,

I intstalled this plugin a few months ago and got the reCAPTCHA to work on my site. However at the time it didn’t always work. Once in a while I get the error message Input error: Invalid referer. I’m not sure if it’s because I updated WordPress but I get the error message Input error: Invalid referer all the time now.

I’m not sure how to go about fixing this.

Thanks.

https://www.ads-software.com/extend/plugins/contact-form-7-recaptcha-extension/