Ultimate Special Offers discounts are added when the customer moves from the Cart page to the Checkout page. To ensure that your customers are able to receive the offers you've created, make the following adjustments to your theme.
Use the theme editor to enable cart redirection, disable dynamic checkout buttons, and disable quick shop buttons to work with Ultimate Special Offers.
Enable cart redirection
In the theme editor, go to Collection pages > Theme settings and scroll down to Enable cart redirection. Repeat the same steps in the theme editor for Product pages.
Disable dynamic checkout buttons
Deselect the option to show dynamic checkout buttons on the Collection pages and Product pages. Customers will have the option to pay with their preferred method at the checkout after Ultimate Special Offers discounts have been applied to their order. 
Disable quick shop buttons
Disable the quick shop buttons on Collection pages > Theme settings in the dropdown menu. 
Learn more about working with Ultimate Special Offers.