Default Printer Changing

Has anyone seen the following problem?

We are on a peer to peer network, Windows XP . I have an
Epson R800 Photo printer physically connected to my
machine. I have 2 computers on the network that are also
printing to that printer. Any time I print to that
printer, it changes the default printer to that printer on
the other 2 machines. It does not change my default
printer though. My default printer stays the same which
is an HP office jet.

Any ideas?