A family of Microsoft word processing software products for creating web, email, and print documents.
Looking at your sample document, when I select the 2.2 heading and press Ctrl+SpaceBar, it reverts to the the formatting of heading 2.1 THE TET OFFENSIVE.
So what you need to do is incorporate the formatting of 2.1 into the Heading 2 style. You can do that by selecting the text and update the style to match the formatting. You'll need to Undo the Ctrl+SpaceBar action with Ctrl+Z first.