I purchased two DVDs from a seller's lot of DVDs; I selected one DVD from the drop-down and clicked "Add to cart", then selected the second DVD from the drop-down and clicked "Add to cart" again, then went to check out. After the purchase was complete, the Order details page showed both DVDs and correct dollar amounts [but note the two DVDs were listed as "(1 item)"]. The printer-friendly page, however, only displayed one of the two DVDs, even though the dollar amounts in the "Order total" section showed the correct total for both DVDs.
The order confirmation e-mail correctly showed both DVDs, but they had identical "Item ID"s. Looking back at the Order details page I see that the DVDs had identical "Item number"s.