Why the GraphQL admin API returns negative Inventory Quantity?
A product/variant can be set to continue selling when out of stock, so this doesn’t sound like a problem.
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hey folks. @Luke’s on point here, if products are set to oversell even if they’re out of stock, you can sometimes see negative inventory quantity values.
We have a bit more info in the docs below on how our inventory system works in case that’s helpful! 
if we had this, then we would be able to understand the stock movement: