I changed PHP version in Cpanel from 7.0 to 7.4 and after that reCAPTCHA displays properly, validates properly, but shows error "Please complete the anti-spam verification" when you click submit button on any form registration / question / comment.
Now I've made a teporary solution by changing PHP version back to 7.0 and reCAPTCHA works properly, but eventually I'd like to have PHP version 7.4. Any ideas?
Plugin: reCAPTCHA v2.0
Edit: I've made a few tests - I've changed PHP version to 5.4, 7.0 (native), 7.1, 7.4 and reCaptcha works correctly on my Q2A site only on PHP 7.0 (native).