Form return 422 error with reCAPTCHA

I have a form that has 4 fields and a reCAPTCHA on it. When I click the save form button, a POST request is sent. Depending on the server response, I save or do not save the form data using standard methods. After saving the form, I get a 422 error. There is a reCAPTCHA in all forms.
There is a pattern I am seeing. I have 2 servers for testing. The first is a stash server hosted on pythonanywhere. When I send a POST request to it, there is no error. When I send a request to the production server, I get the error.
I don’t understand what the problem is. I am trying to save the same data to show up in the “Form submission data” section.

@belonogov220 - Are you using Webflow hosting with a Webflow project?