JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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.
Please note that you'll get two emails, one from your form and one from Paypal (payment notification). When you say multiple, how many emails did you receive? Checking further your email history, you are only getting 1 email per person that submits your form.
You can check your email history by following the steps from this guide: https://www.jotform.com/help/293-How-to-view-all-your-form-Email-History.
Please check the number of notifications and let us know.