Checkout Page Showing Error?

The link btw is password-protected. Password is coostore

Anyway, for some reason, my co-worker is unable to load the cart page.

See the following screenshot: http://www.redstainmedia.com/wp-content/uploads/2018/03/Screen-Shot-2018-03-15-at-10.40.09-PM.png

I’m able to process checkout successfully but there is definitely something glitchy going on here.

For instance, when I process the checkout with a coupon code, the checkout page refreshes itself after I hit submit and once again shows the total while removing the coupon code. So on the front end, it looks like the order did not go through. However, I get an email showing the receipt and link to product I ordered successfully.

This is really weird how two people have two different user experiences.

We’re using Google Chrome and I’ve cloned this site on a separate server to test it further. I’ve disabled ALL plugins except for WooCommerce but the glitching is still the same.

Can someone help, please?

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