Double text on shared printer

Archived from groups: microsoft.public.windowsxp.print_fax (More info?)

I have several pc's networked with a Lexmark Z12 printer
set up on one of them. If printing from the PC conected to
the printer, all is fine. If I try to print from any other
PC to the printer, It prints 2 letters together making it
very hard or impossible to read. It's like it prints it
twice on the same page at the same time.
This is the same if printing pictures or even web pages.
The PC's are all running WinXP. No problems with printing,
I just can't read what it prints.
I've looked through all the post and found nothing even
close to this problem.
Any ideas would be appriciated.