ReCaptcha

@tphamdev12 Sounds like a conflict. I would recommend going though this: https://wordpress.org/support/topic/google-recaptcha-verification-failed-3/

You can try using a different reCAPTCHA plugin or forms plugin to avoid conflict. Or report the issue to the developer support forum.

What cache or asset optimization plugin are you using? I would recommend disabling it. In many cases, caching and minification can result in the reCAPTCHA script being loaded incorrectly.

Hope that works 🙂