Problem description:

1) In modeling, the cut list is correct,
for Item No 8, the part Qty=2pcs,
the total item is 15;

2) after made 2D drawing, Insert the BOM is like right form,
For item No 8, the part Qty change to 1 pcs,
add one item (No 16), and the Weight is 0.

Is it a software bug? Anybody can help me?

(PC is HP-Z600 workstation, win7, Solidworks 2010 Pro.)