I see that this page has a JavaScript error related to Stripe. It is likely because the page is not secured but you have Payment Buttons enabled.
I would recommend that you set the entire set to use HTTPS. You do this by going to Settings->General and editing your site URLS to use https:// instead of http://
Plugin Support
melinda a11n
(@melindahelt)
Automattic Happiness Engineer
We haven’t heard back from you in a while, so I’m going to mark this as resolved – if you have any further questions, you can start a new thread.