Problem is the Mopier Mode being enabled. To disable Mopier Mode:

Click Start
Click Devices and Printers
Right click your Laserjet Printer
Select Printer Properties
Click the Device Settings Tab
Scroll down to the bottom
If necessary, expand Installable Options
Click on Mopier Mode
Select Disable in the selection box that appears
Click Apply
You will now get multiple copies

Source: http://h30499.www3.hp.com/t5/Printers-LaserJet/LaserJet-1320-Not-Printing-Multiple-Copies-Anymore/td-p/1125929

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