The issue is widow/orphan control. See
http://sbarnhill.mvps.org/WordFAQs/BottomLine.htm

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Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
Word MVP FAQ site: http://word.mvps.org
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"Lin McDowell" wrote in message
...
I have finished laying out a 113-page book in Word 2002 on a PC. It is
comprised of non-numbered front matter, and 9 chapters page-numbered in
the
footers. It also has a running book title head on one side, and chapter
titles on the other side. My problem is that some of my pages seem to end
a
line shorter than others. I have checked the formatting-the style is the
same throughout; the text is justified left and right; the page numbers
are
all the same font and size; the gutters are all set to 0". These pages
all
begin at Line 1. When i try to manually type in the last line, it
eventually
shifts over to the next page, leaving the preceding page a line short
again.
Is there something else that could be responsible for my problem? Thanks
for
any help.