Volume Discount is displayed in cart but not in checkout

[MG2201]

Hello together,
we have a problem with our checkout. We are using the Volume Discount by Shopify. So we offer 20% sale for a volume of 10 books. And worked normally for a time. And if I now add 10 products to the cart the discount displays there perfectly. But when I want to buy it in the Checkout there is no volume discount anymore. And it is not in charge.

We are using the Debut Theme.

[cronics]

Hi @MG2201 ,

You can try the Quantity X app that displays discounts on the checkout and even more - it upsells on checkout: