The Shopify Ajax cart makes it possible to add items to the cart, update quantities in the cart, and fetch information about the cart, without a page refresh.
However, this customization within your store does not work with our Discounted Pricing app.
This is because the discounted pricing set for your product won’t be reflected within your cart since Ajax does not refresh the page to update the changes. So the customer has to checkout through the existing cart page itself.
To use discounted pricing, you need to disable your Ajax cart.