What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
To embed your form to Facebook in Form Builder version 4, just go to Publish > Platforms > Facebook.
I test this on one of my test form and I was able to embed the form properly on my Facebook page.
Please try to re-embed the form on your Facebook page and see if this will fix the issue. Before you re-integrate please ensure that you have removed the JotForm App on your Facebook page. To remove the JotForm App, just go to your Facebook Page Setting > App > Click [X] button.