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.
How can I avoid receiving a double submission.Asked by SimonsTransports on June 03, 2016 at 12:05 AM
I have customers that make a submission and i receive it and within a few seconds or minutes the exact same thing comes through again. Are my customers doing some on their end that is causing this and can I fix this?
You can enable the Unique submission feature on the form.
User guide: How-to-Set-Unique-Submissions-on-a-Form
It is possible also that your form was compromised by spam the reason there are now spam submissions.
You can also add the Captcha field on your form so that it will require captcha validation before the form can be submitted.
User guide: How-to-add-a-CAPTCHA-field
Hope this help. Let us know if you need further assistance.