National Park Print Shop review for Retail Barcode Labels

The app creates barcodes using the last 8 digits of the variant ID. But this means that it's easy for the system to create duplicate barcodes if you have a large number of variants. This seems like such a basic requirement of a barcode system - that it should generate unique barcodes. I can't believe this is an official Shopify app and they've overlooked such a fundamental bit of functionality.