I don't know why you're not getting the expected results, but here are two
ways to correct the problem:
First Method: Correct the alignment.
1. View | Header and Footer.
2. Select the frame containing the page number (it's easier to see this if
you have text boundaries displayed) and right-click.
3. Choose Format | Frame and, for horizontal position choose "Center
relative to margin." OK to close.
Second Method (preferred): Replace the page number with a footer
1. View | Header and Footer.
2. Select the frame containing the page number (make sure you have the frame
selected--you'll see six black handles) and press Delete.
3. Press Ctrl+E to center the footer paragraph.
4. Click the Insert Page Number button on the Header and Footer toolbar.
5. If your footer contains other text, you can use the built-in tab stops
instead of center alignment; there's a center-aligned tab stop at 3" (the
center position of the default 6" footer paragraph), as well as a
right-aligned one at 6". If you have changed your document margins, you'll
need to move the tab stops to be at the center and right margin of your
actual footer.
--
Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
http://word.mvps.org