JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I did check your form and it does work as expected. I am unable to replicate the issue you are having. It seems to redirect to the PayPal checkout page as expected. Please check the screenshot below:
Have you embedded this form in your web page where you are having this issue. Please share the web page URL and we will take a look.
We will wait for your response.