Retail Barcode Labels

Thank you for taking the time to share this feedback! Duplicate barcodes can be assigned to multiple variants when their IDs share the same last 8 digits in larger product catalogues. Please reach out to our Retail support team via help.shopify.com with the details and we can investigate further for you. They'll be able to review and confirm the cause, and advise on next steps.
- Natasha, Shopify Support