NX Quantity Column in Structure Manager is blank for some components

Why is the Quantity column blank in Structure Manager when the component exists and clearly has a quantity in NX?

If there is only 1 of the component, the 'Quantity' column in Structure Manager can be blank because there is no additional quantity to report. When viewed in NX, it is noted that these components with a <blank> quantity in Structure Manager only have a Quantity=1 in NX.