A listing can be stranded if it wasn't created properly from the start or is suppressed. In this case, storage fees will be charged, but it cannot be sold because the offer is not active. Check this with the inventory report
Your performance is measured by the percentage of your inventory
that is currently not available for purchase from Amazon. This is known as the “percentage of stranded inventory”.
The other metric you need to consider is the quantity of stranded units, which represents the total number of units without an active offer, and the “Fix Listings” button, which lists the SKU units with no active offer. The Bulk Fix Stranded Inventory Report
option can be used to sort these.