When inventory is collected from systems using Stand-alone Inventory, the records consume inventory licenses.
This is working as designed. Whe Stand-alone inventory is collected and sent to the SMP Server, the Inventory is processed into the database. When this information is processed, a license is consumed for Inventory Solution. As long as that record and its inventory are contained within the database, it will continue to consume a license. Once that inventory is purged or the record deleted, the license that record consumes will be released.