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.
I checked your form and I can see that the "Unique Submission" is set to "Check cookies only". This means that a user who already submitted a form cannot do another submission using the same browser. Here's a screenshot:
In the Form Builder V4, you can change this by clicking the "Settings" button at the top menu. Go to Form Settings, scroll down and you'll see the "Unique Submission" drop down. Please change it to "No Check".
Please check this related guide: How-to-Set-Unique-Submissions-on-a-Form.
Hope that helps. Thank you.