What reCAPTCHA plugin you use? If you only use wpDiscuz Built in reCAPTCHA, please configure it again. Remove current inserted keys, create new keys for reCAPTCHA version 2 "I'm not a robot" type and set it in the wpDiscuz reCAPTCHA settings. Make sure all other reCAPTCHA plugins are disabled.
This is not a beta error. This is a reCAPTCHA conflict. Try to solve it yourself, I can't help you in this issue. You should disable one of them or reconfigure one of them to fix the issue.
@tomson OK! I got it. Since only registered users can leave reviews on my site, I remove the reCaptcha in WpDiscuz, because it is not needed. And I leave only for the ContactForm 7