🚀 go-pugleaf

I have a document that is 2 pages, it is of a chart. The first page prints fine but when the second page prints it only prints some of the vertical lines on the chart. All of the horizontal lines and text print fine it just skips some of the vertical ones. Anybody have any idea why?? This document was created in Acrobat 6, and the person that created it can print it fine but when others try, using reader 6 this happens. I tried using Reader 7 and it prints fine??? The problem is these are documnets that are on our website and I don't want others to have problems printing. Any help would be great.....Thanks.