JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Please follow this user guide on -Adding-Form-to-Google-Sites
The Google Sites embed code is available in the Embed Form wizard
Follow the steps indicated.
It will also help if you can share to us the URL of your Google website so that we can also check th actual embedded form.
Hope this help. Let us know if issue persist.