A family of Microsoft word processing software products for creating web, email, and print documents.
Is this Word for Windows? The version and operating system are important info, because Word is different on different platforms.
If you do have Word for Windows, you should be aware that TOC entries add the text from each heading but it also adds the tab stop that follows the paragraph number. Therefore, you can adjust the tab stop positions to accommodate wider numbers (more digits). In many cases, clicking in an affected TOC level and dragging the tab stop fixes the issue, because the TOC styles (TOC 1, TOC 2, etc.) are set to update automatically. As an alternative, you can explicitly modify each style through the Modify Styles dialog box.