We scan our packing Slips into the search box on the shipping screen to match the order we are holding to the correct address on the screen.

If the scan does work (sometimes due to lag, the scan will miss a digit) or if the order number is not found, or if that order was already shipped... it does not find the order.

Unfortunately, this is notated by a quick popup window that says "not found" or "already shipped" which appears for 2-3 seconds and then disappears.  The order that was highlighted before your scanned is still highlighted now.

During hectic times, if you were not watching the screen, you will assume it has moved to the order you scanned, causing for shipping errors.

These types of errors should wait for you to acknowledge the error with an "OKAY" button instead of self-clearing.