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.
It seems that your form is conflicting with other scripts. Can you try using iframe for your form using Paypal? You can get the instructions on how to get the iframe embed code of your form following this link: https://www.jotform.com/help/148-Getting-the-Form-iFrame-Code
Please do let us know if you have further questions or other concerns.