NX Quantity in the ANT is different than the QTY in the Parts List.

The Assembly navigator shows a different quantity value than the Parts List. When the component is Packed it shows the component as "Bolt x 61", but the Quantity column in the Parts List has the Bolt component with a value of "60".

One reason that the ANT and Parts List could have a different values is that the component is Packed and there is 1 component occurrence that is Suppressed.

To help with the confusion toggle OFF the option "Include Suppressed Components" from the Assemblies Navigator so that the quantity of the "Packed" component will not included the suppressed components.