canon i560 color printing unstable

When we tried to print color, it hss 2 problems:
1. All color areas print like a double exposed photo.
2. Also prints part of the page and bottom of 1st page on a second page.
Changed to another i560 Canon and got same problems.
New drivers from Canon installed…same problems.
Both printers work fine in color & B/W on another computer.
Printer test page prints OK.
All setup and registration has been done twice.