Hi brando,

It sounds as if your're not using a heading Style for the heading or, if you are, the rest of your document is using the same Style and, whichever approach you're using, everything is based on a Style whose underlying attribute is set to 'automatically update'. That means any change to the paragraph formatting for that Style affects all text based on the same Style.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]