Form stuck when I submit my payment form with Authorize

I have used the integration tool and have verified that it is successful with the "test integration button", why does my form stay stuck once I submit the payment?

We use authorized.net

As I tried to submit your JotForm (http://www.jotformpro.com/form/50754033703953) I was able to submit normally. However, I receive an error message that the credit card information is invalid since I use test credit card number. Also, I have cloned your JotForm to my account and I was able to submit the form without an issues after enabling sandbox mode. I've cleared your form caches from my end. Could you try clearing the browser cache to see if that helps. Please follow the steps provided in the guide below to clear the cache.

http://www.wikihow.com/Clear-Your-Browser%27s-Cache

Please get back to us if the issue still persists. We will be happy to help. Thank you!