Google ReCaptcha not showing for replies

I have three issues with the ReCaptcha Add-on: 

1.) ReCaptcha displays fine on general comment form. However, on the reply-forms it is not loaded. 

2.) On the Google ReCaptcha page I get the error message: "We detected that your site is not verifying reCAPTCHA solutions. This is required for the proper use of reCAPTCHA on your site."

3.) The add-on does not seem to work with Google's invisible reCaptcha option. If this is activated, the reCaptcha still displays in the comment form.