I haven't seen that problem.

Is your index at the end of the document (and therefore its size could alter the subsequent page numbers)? It would be good practice to put the index at the end of the doc.

Also, how are the pages numbered? The page number settings can be configured for each section so the page numbers are accurate but it is also possible to hack page numbers to display a number on the page which is not how Word considers the page number. Select a page number and reveal the field code to check what its options are.

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Andrew Lockton
Chrysalis Design, Melbourne Australia