Sounds like your detail section page width, plus your margins, is wider than
the paper. You should decrease your margins or your section width to be
equal or less than the width of your paper.
In addition to Rick's suggestion, this problem sometimes arises when you
have a control (often a line or rectangle) on the report that extends ever
so slightly across the margin of the page. It can often appear only as a
single dot on the last page and is, thus, difficult to see.
