ReCaptcha, as an obstacle during registration?

Question

reCAPTCHA

Good day! As an incompetent person in these matters, please explain the solution to this problem. When registering on the site, with the correct filling in all the necessary lines everywhere and pressing the "final button", the page is only updated with, so to speak, the error "true -" and makes it possible to re-enter another word in the recaptcha. And so constantly.