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.
You could add a field of the same type and with the same name and the submissions should be shown again.
Now if you want to restore the old one, you can always checked out our Revision Tool and go back to the version where the field was still present.
You can see here how to do that: How to View Form Revision History