On the Organizer page of the Paragraph Style dialog box is a check box named AutoUpdate. It is present only for paragraph and frame styles. If this check box is selected, then OOo will apply to the style itself any modification made manually to a paragraph formatted with that style.
|| If you are in the habit of manually overriding styles in your document, be sure that AutoUpdate is not enabled, or you will suddenly find whole sections of your document reformatting unexpectedly.
The Organizer page of the Paragraph Style dialog box.