If you post a document with the problem I'm sure it will be easy enough to diagnose.

Things to check include:
Are there tracked revisions in the file? If so, make sure you can see the deleted content
Select the first paragraph on the page - what are its paragraph settings for space above or below?
Is there something in the header with text wrapping turned on? This could include white boxes.
Is the section setup set to align top or align middle?

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Andrew Lockton
Chrysalis Design, Melbourne Australia