Thanks for posting about your cart and checkout buttons.
Offsite gateway buttons like PayPal's can appear either on your cart or checkout pages but not both.
If you would rather have this option show up on the checkout page, you can follow the steps in this guide to hide it from the cart and have it show instead on checkout.
If you need a hand with this, you can reach out to us via support channels and we can help out from there. :)
Best of luck!
Don | Social Care @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog