Why when adjusting the quantity of zero cost products it still had a shrinkage value?

Good day to you, @accounting-2tuf2.

Welcome to the Community. I can definitely share insights about your concern with adjusting your inventory entries in QuickBooks Online (QBO).

Regarding this matter, your entries still have the shrinkage value after making changes because QBO automatically records the adjustments to Stock Asset and Cost of Goods Sold under the Inventory Shrinkage account.

An inventory shrinkage account is a default account automatically created once you adjust the quantity on hand on your product.

That being said, I recommend reaching out to your accountant for professional advice when adjusting your entries. If you're not affiliated with one, you can utilize our Find an Accountant tool to look for one in your area.

Additionally, I'm attaching this article for more information about Inventory adjustment: Adjust inventory quantity on hand in QuickBooks Online.

On top of that, you can run reports to check your best sellers, what's on hand, the cost of goods, or your inventory status: Use reports to see your sales and inventory status.

Please know that you're always welcome to post if you have any other concerns about inventory shrinkage or QBO-related concerns. Wishing you and your business continued success!