Contact Form 7 Multi Step Pro

Hello, I am using Car Dealer theme websites.

I have installed Contact form 7 and Contact Form 7 Multi Step Pro.
My all multi step forms are not proceeding further(next step)
Can anyone debug this issue and please tell me path to resolve it as soon as possible! 

Here is link of form : https://southbend.rbcar.chromacars.com/car-financing/

The page I need help with: [log in to see the link]