I am printing 2 pages side by side on A4 peper. This should give me an A5 booklet at the end. The preview window shows the pages centred on the paper, but when it prints there is a much larger margin on the left hand side. After hand feed double sided printing, I cannot fold in half as center is different on the 2 sides and is not the center. HP 6110, Windows XP, Reader 8. Any advice welcome.