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.
Probably the user was hitting the submit button repeatedly, to avoid this I would recommend you to set unique submission on your form to prevent multiple submissions.
1. While in the form builder, find and click "Setup & Embed" tab the "Preferences" button from the toolbar
2. In the preferences window, click "Form Limits" tab and Select the "Unique Submission" option you prefer
3. Click "Close Settings" button and save the form changes by clicking the "Save" button from the form builder.
There is a difference between strict and loose check.
Loose Check controls the cookie.
Strict Check also controls the IP address.
If you select Strict Check, people in the same network (in the same school, college,university, institution ) will not be able to make submissions, as the IP address for the network would be the same. If you are considering the target audience as students in the same school, Loose Check should be chosen.