Appointments+ payment not working

Hi, My payment is not working. everything goes well, but when I confirm, the payment button confirmation doesn't show up and the appointment is automatically confirmed.

1- Yes, I set to payment required and tested both live and sandbox.
2- I already set the price.
3- I already deactivated every plugin and activated the Twenty Fourteen theme. It's still not working. My wordpress version is 4.2.2

Does anyone know what it could be?