How to identify an error in reCaptcha v2?

Question

PHP

Good afternoon,
one of the sites refuses to work reCaptcha v2.
While submitting the form, the following message appears:
"Requested page is loading. Please wait ..."

After that, the page is refreshed and that's it.
The form doesn't work.
Moreover, the code that I use to work captcha on other sites works fine.
And this is the message.