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When indents change unexpectedly in a numbered or bulleted list, you have to verify that they have been set up properly. Click in the first level 1 item of the list and then click Home tab | Multilevel List | Define New Multilevel List (although the "new" part is misleading). Adjust the settings in the "Position" area as desired. You may have to click the More button to see all options.
Keys
reseat formatting to default: Ctrl^Q