The styling is not loading properly so that is why the button is not displaying properly.
Here is the solution:
1) Click into “design” and into “edit html/css”
2) Click into “no-header” page layout
3) Here locate this code:
</head>
4) Directly above it, insert this code:
<style>#wsite-com-checkout-cart-footer { padding: 5px;}.wsite-button.wsite-button-large.wsite-button-highlight. wsite-checkout-button.wsite- com-paypal-checkout-button { padding: 0;height: auto;}.wsite-button.wsite-button-large.wsite-button-highlight. wsite-checkout-button.wsite- com-paypal-checkout-button .wsite-button-inner { padding: 0 20px;}</style></head>
5) Save your change and re-publish your site