If your document extends to an extra page then it means there isn't enough room on the preceding page for the last content.

One of the formatting issues you might be encountering is that Word docs always have to end with a paragraph mark and a table will ALWAYS have a paragraph after it. You could look at tweaking the page setup to give yourself a touch more space on the page or reduce the size of the last paragraph so that it doesn't have space before or after assigned to it.

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Andrew Lockton
Chrysalis Design, Melbourne Australia