How to prevent duplicate submissions?

You can prevent the user from submitting the form twice or more times by creating unique questions (e.g: a user ID etc.), or you can use cookies or the user's IP address to make their submission unique.

You can set up "Unique Question" question on your form to do that.

Here's a guide — How-to-set-Form-Limits-Based-on-a-Unique-Question

You can also limit form submissions based on multiple fields in your form.

How-to-Have-Unique-Question-Using-Multiple-Fields

You may follow this guide to set unique submissions in your Form:

https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form

Hope this works!

Thanks.