Order entry qty on SHIPPED TO DATE doesn't match the qty for multiple shipments

I have an order with 20 on original order, and we shipped 4, 7 and 9 on three shipments. However, when we look at the order entry, the Shipped to Date is only showing 4.

I have back check some other multiple shipments, and we have the same issue that the Shipped to Date is not showing all the qty shipped.

Anybody has an idea of what is happening here.

Thanks