When you see two asterisks next to the on-hand quantity listed on an item in StockIQ, like so:
This indicates that the total you are seeing is the result of on-hand quantity from a replaced item and a replacing item being summed together as part of an Item Site Replacement linkage.
You can see the detail of old vs new inventory in the Inventory Snapshot dialog, in the On Hand tab:
For more on replacements, see the Item Site Replacements topic.