The submit form shortcode only asks user for rating and review. What about name, location, title or any other additional field?
The review form by default displays the “Name” text field, “Email” text field, “Your Rating” star ratings, “Your Review” text area and the Submit button.
You must have been already logged in with your website as an admin or another user. The form hides those field for users who are already logged in as it uses the registered name and email address from the default wordpress account.
You can also change how the form configuration on the WP admin dashboard > SIP plugins > Reviews Shortcode then under the Settings section.
Let me know if that information helps.
Have a great day.