Quantity on Sales Order Variance

I have been noticing that the quantity on Sales Order in the Item Inquiry Tab 1 "Main" screen and on Tab 3 "Quantity" screen does not match with the amount on Tab 6 "Orders screen.  I have noticed that there orders appear on the "Orders" screen that are back orders but the item showing is not backordered on that order.  It was originally on the order and it shipped but not all items did so the order is in back order status but this item has shipped so I am confused why this order would even still be listed.  For example see orders G410795 and B224656.  These items are back order but this item has shipped on both items.  Why do these orders appear still?  If they are supposed to still appear, why doesn't the shipped column say the shipped quantity so that the net on Sales Order is correct?

4251.On Sales Order Images.docx

 Any explanation is appreciated!

Tyler