Without actually seeing the problem document, it can be difficult for anyone to diagnose the issue. Can you attach a document to a post with some representative data (delete anything sensitive)? You do this via the paperclip symbol on the 'Go Advanced' tab at the bottom of this screen.

FWIW, spacing will vary if the paragraph uses justification and the text length approaches or exceeds a full line, as Word adjusts the spacing to suit.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]