That doesn't apply to me. Are there any other reasons why this could happen?
Yes, it can also happen if you are selected for verification.
Ah, then it all makes sense. Say, what if I have any questions or don't understand what's in the aid offer?
Then you should contact the financial aid office at the school. They re there to help. It's important to understand what you're being offered e.g., which items in the offer are grants and which are loans.