I have having the same problem.  I just realized an order I already packed up and shipped is still in my mobile device queue.  When I look in the sales order procurement screen, I am now seeing multiple orders that have already been shipped but still show under "Express Pick and pack"  Looks like there is no way to correct this without messing with the inventory counts.  I am not surprised as we've had a lot of small issues like this pop up since we've started using Quickbooks Desktop.