Yes, this is happening because you modified the plugin directly to remove the email field from the form config.
Don’t do that! Not only will your changes be reverted when the plugin is updated, but you may also break the plugin functionality.
To remove the email field from the form, use the hide option on the [site_reviews_form] shortcode (as is explained in the Shortcodes documentation on the Site Reviews > Help & Support page).
[site_reviews_form hide="email"]
A little more detail:
Site Reviews uses both client-side and server-side validation. While the form passes client-side validation, the server-side validation is failing because the email field was not submitted, it’s expecting the email field as it was not disabled correctly.
Because you removed the email field from the form config, there is no email field to display the “required” error (you likely still have the email field set to “required” in the settings) so all you see is the overall “Please fix the submission errors” form error.
