Hello Muntasir and Paul,
@Paul,
I thought that too but two of my other pages actually have two captchas that work perfectly (and would have 3 if i enabled for the newsletter sign up), see https://tsri.com/modernize and https://tsri.com/contact-us. It works perfectly there.
The only difference here is that the Newsletter (bottom right one) is the SP Page Builder "opt-in" form. Where it will ask me to compelte the captcha. Right now i have it turned off because it doesn't work and continues to ask me to complete it even though i completed it, and even completed both of them if i have them both enabled.
@Muntasir,
The problem is not that the captcha is not completed - I think that works fine! The problem is, that the SP Page Builder "opt-in" form does not recognize that it was completed in fact. Regardless if even both captchas are solved. It is almost like the opt-in form does not recognize that is was solved. Having both captchas in fact works (see response to paul above) but having the captcha enabled in the footer/opt-in form, will give me the "complete the captcha" message.
Right now i have the captcha disabled for the opt-in form in the footer, which gets me around 100 spam email sign-ups a day unfortunately.