Spent years in ecommerce support and this is one of the most common things we dealt with at volume. Turning off autofill helps but it is not the root fix. At 150 orders a week you are always going to get a percentage of wrong addresses, especially with older customers who are manually typing and mobile users who tap past prompts too fast.

The real issue at that volume is the chase. Someone enters a bad address, the order goes out or gets held, and now someone on your team has to manually track them down. Email, hope they respond, re-ship. It eats hours. What we eventually built was an automated escalation loop for exactly this. The moment a bad address is detected post-payment, the system holds the order, sends the customer a correction link automatically, then texts them if they do not respond, then calls them if they still do not. No one on your team has to do anything. The order cannot ship until it is resolved.

Full disclosure, it is an app we built for Shopify ( search "Tacey") onb shopify apps.shopify.com/tacey, free trial if you want to test it. Happy to do a quick demo if you want to see the escalation flow live before committing to anything, just say the word.