Why did I have to pay for a full extra day of parking when I only stayed 2 hours past my entry time?

Our economy and daily lots are charged based on a flat rate per 24 hours from the time you enter. If you exceed 24 hours, you will be charged the flat rate for an additional day. Our hourly lots are $2 per 15 minutes up to the daily maximum for the first day. After the first day, they are charged at the flat daily rate per additional 24 hours.