This situation could stem from the original order having missing or extra units of the SKUs, from a human error when processing the return, or from the announced return quantities not matching what was contained in the original parcel.
Additionally, if you have recurring customers, they will often send products from previous orders in one return. If this is the case, we recommend looking into the history of orders from the customer to find the corresponding orders that contained the products and informing your customer so that they clarify which order they are returning including the order ID in the parcel in the future.
Keep in mind that once the return has been processed, it is not possible for us to edit the information on the Hive App since the units received are no longer in the return area. All inventory discrepancies caused by these returns should be spotted and corrected in our periodical inventory checks.