Express wallets hand over only a partial address (ZIP, city, state, country - no street or name) until after payment. With incomplete data, PDQ sometimes can't run a full live rate calculation and serves a cached or fallback rate, which can differ from what a card shopper sees.
What to know:
This is a Shopify platform limitation with express wallets, not a PDQ misconfiguration.
It most often surfaces on oversized/multi-origin carts, where the correct rate depends on the full address.
Card and Shop Pay-with-full-address checkouts calculate normally.
💡 If a specific wallet order was charged the wrong method, share the order number with support - we can confirm from the logs whether the wallet skipped live calculation.
Related: Why is shipping doubled on some orders?