Why it's flagged. Lines start with a typed dash, asterisk or number rather than a real list. The characters print as typed, and the lines don't get list spacing.
How serious. Just noting.
How to fix it. Usually nothing to do. For real list spacing, in any editor:
- Select the lines and apply your editor's bulleted or numbered list.
- Delete the typed dashes or numbers.
- Upload again.
When to leave it. If you want the typed characters exactly as they are, for example a numbered list inside a quotation, leave them.