Why do duplicate submissions happen?

On our current form we've had over 25 different entries become duplicated (some 2 or 3 times and one of them 25+ times). It is agitating when trying to get a solid idea of your submissions and when sorting data.

It happens when the user submits the form twice. You can try setting up unique submissions to prevent duplicates: https://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form