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I am able to reproduce the same issue that you're having. At the last page, when I click next button I am getting an error as you see below:
I will check your form deeper and get back to you soon with a solution.
First of all, we are sorry for the iconfision. It might be related with your Terms & Conditions widget. I've removed the Terms & Conditions widget and added it again.
Now, everything is fine on my side.
Here is how it works:
We would appreciate it if you could also remove the Terms & Conditions widget and add your form again.
At that time, it will work as expected.
Please, also test it on your side and let us know the result. We will wait for your response.