Sales Order / Back Order Updates

Hope I am formatting this correctly. Running a back orders report for the month, I came across some inventory items that we for sure have in stock. Digging into the cause I found that data entry had manually entered some cancelled orders for one customer as negative qty shipped but not negative qty ordered (zero qty ordered). As a result, our inventory is correct ("negative shipped" item returned to inventory) but now there is an outstanding item to be fulfilled in our back orders. In a test company, I adjusted the Sales Order to negative qty ordered, so they would not show up on the back order report (mission accomplished), but they still show on the open sales order. The invoice created from the original sales order has been updated & when I look through the details it shows negative shipped but there is no qty ordered detail on the lines tab when looking at past updated invoices, just "shipped" detail.

What am I missing? Still learning how the modules talk to each other and how that affects the GLs. Goal is to reduce sales and increase/debit inventory, but inventory was already increased.