Printer sharing on W2K Pro workstation

Some of my printers are shared through Windows 2000 Pro workstations. The problem is that, although the print works as normal, copies of some jobs remain in the queue and are printed when the serving W2K workstation is restarted (eg, next morning).
I have looked at the 'print spooler' service properties and, short of manually deleting the offending jobs, have come up with no solution.

Any ideas would be much appreciated.