I’m using this plugin with Gravity Forms. On pages with one single Gravity Form, it works flawlessly and is very helpful. But on pages where there are more than one Gravity Form, each form shows the “ERROR for site owner: Invalid site key” and when you try to submit the form, it gives a “The reCAPTCHA was invalid. Go back and try it again.” error. Since it works when there’s only one form, my key has been entered correctly.
I’m happy to provide further troubleshooting details – just let me know what information would be helpful.