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Your document might have lost the connection between style and outline level. Goto menu "Tools", item "Outline Numbering". You should see "Heading 1", "Heading 2", ... in the right list in the tab "Numbering". If there are empty lines, choose that level in the left list and select the to be associated style in the drop-down-list "Paragraph style".

Or the heading itself has lost its style. Set the cursor into the heading and look whether "Heading 1" is selected in the "Apply style" list field of the formatting toolbar. If not, select it there to assign it to the Heading.

For a better help, you should provide the document for download.