[Centos] Samba print queues showing old jobs

We have a server running Centos-3 with all latest updates. The server
hosts 3 printers for us which are accessed by various Windows clients. 

About 3 months ago we noticed that, after a cups update, if you looked
at the print queues in Windows they would show old jobs that had long
been printed. After a further cups update this quirk went away but it's
just come backs again - possibly after the recent cups update. Or is it
me!? Anything worth checking?

Thanks 

Nigel Kendrick