Number of copies in print queue increases "automatically"

This just started happening last week. When I send one document to the
printer, to print one copy, initially it shows 1 copy of 1 page. But as
the document prints, the number of copies indicated keeps increasing.
Have seen it go as high as 56 copies, before cancelling the job. It will
print continuously unless I cancel the job.

Sending the document direct rather than spooling, seems to result in 1
document.

The printer is fairly new (HP PSC-1315v). I did try removing, and
installing the latest HP driver, but it made no difference.

Any help will be very much appreciated.

Thanks,
Larry