My Google Form is embedded in a website. Could that be influencing the submit button's functionality?

Yes, the embed environment can cause problems. Ensure the website where the form is embedded is using a secure HTTPS connection. If the website has JavaScript errors, they could potentially interfere with the form's functionality. Also, check if the website's security settings or browser extensions are blocking certain elements of the form from loading or submitting. The form may not be properly embedded or the embedding code may be malformed. Try re-embedding the form or checking if the embedding code is the latest version.