I see the discounts on the storefront, but they’re not applying in the cart or checkout. What’s going on?

Shopify's automatic discount limit
Shopify allows a maximum of 25 automatic discounts. If that limit is reached, Discount Mixer can’t create or sync the necessary automatic discounts. In this case, you’ll likely see a banner in the app alerting you.
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To resolve this, go to your Shopify Discounts section and delete unused automatic discounts. Then return to Discount Mixer and click Create automatic discounts. This will re-sync the necessary discounts and allow them to apply properly at checkout.
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Missing or deactivated discounts

If you’ve accidentally deleted or deactivated any of the automatic discounts we created, they may still appear on your storefront but will not apply at checkout.
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For older installations, please ensure you always have at least two active Discount Mixer-generated automatic discounts in place: “Advance Product Discount Mixer” (or “Product Discount Mixer”) and “Shipping Discount Mixer.”
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For newer installations, you’ll only need one active discount in your Shopify admin: “General Discount Mixer.”