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Hi there, pedigoc.
Let's get this sorted out so you'll get back to business.
The refund receipt might be the reason affecting your COGS. You might want to check the transaction to see the affected accounts. Here's how:
From there, you'll be able to verify the affected accounts that might be the cause of the negative value to your COGS.
I'd also recommend consulting with your Accountant to ensure everything is recorded properly.
Please tag me directly if you have follow up questions. I'm always here to help.