Fusion reduces image on page when printing

When I print a PDF to my Samsung laser printer using Fusion, the image is sometimes reduced by 4%. This does not happen when I print the same PDF document using Acrobat Reader or if I print it from the original Word document format. I've checked printer output settings and it should print full-size (i.e., it's not set to reduce-to-page or reduce-to-printer). I'm using Fusion v. 1.12.

I've also had the experience where Fusion sometimes shifts the PDF document down 1/8th of an inch when it prints to the same printer, yet that does not happen when the same document is printed using Acrobat or I print it from the original Word document format. In all cases the paper is fed from the same standard tray, not manually fed.

Any ideas about what might be causing this?

Rick