Thanks for adding reCAPTCHA v2 & v3 support into Porto – excellent!
However, to work correctly reCAPTCHA v3 has to be on every page of a website, not just the page(s) with the contact form on them. This let’s reCAPTCHA score the visitor by their actions even before they get to the contact form page.
This is not essential, it can be on the form page(s) only, but it works better and is designed to be included on every page of a site.
Perhaps your instructions should include this information, with instructions on how to implement it site-wide?
As you mentioned, include in all pages is not essential but will improve the score of google recaptcha to detect bots.
We will update our documentation with this information and instructions about how to add in all pages.
Please, try that and let us know if you need further assistance.