Why does my order discount or minimum amount use a lower cart total than expected?

Because Order promotions are calculated after Product promotions.

Promotions are applied in this order:

Product promotions → Order promotions → Shipping promotions

👉 Example: a cart of 100 with a 20% product discount is worth 80 when the order promotion is evaluated. A "Spend 100" threshold will not be reached.

Also check:

• Shipping costs are not counted in the threshold
• Only qualifying products count toward the amount
• Excluded products are not counted