What often happens is that people over-ride Style definitions with hard-formatting, so text that has a particular Style attached doesn't look the same as other content in the same Style. The same can happen if text is copied from elsewhere and the user uses the 'keep source formatting' paste option.

Your can remove character-level hard-formatting by selecting the paragraph and pressing Ctrl-Space. You can remove paragraph-level hard-formatting by selecting the paragraph and pressing Ctrl-Q.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]