I am having problem when adding comment as guest. I have filled out all the comments requirement and did the re-captcha.
After I check on send it say: Error: You entered an incorrect CAPTCHA answer. Please go back and try again.
Screenshot with Comment guest turn on.
I have also try turning off the captcha in the backend and it won't allow to send the message and said that the captcha is invalid even though I have it turned off.
Please make sure there are not any other CAPTCHA plugins installed on your website. Please check the plugin list and deactivate other CAPTCHA plugins, delete all caches and check again.