Why Was I Charged $30 For Airfare I Purchased With Skymiles?

I had 25,000+ Skymiles and purchased roundtrip airfare from Atlanta to Dallas (DFW). However, I was charged $30. What is this fee for?

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Baggage Allowances on Flights
...area for baggage purposes and will be subject to the same fees. Checked Baggage—International For customers ...second checked bag fee include: First and Business Class passengers SkyMiles and ...Canada, and EUR amount will be charged exit Europe. For tickets purchased on or before December 12..., 2009 and on or after February 5, 2010, fees established by the contract of carriage in effect at the time...
Risk-free Cancellation
... request must be made by midnight of the day after the eTicket is purchased or midnight of the departure date of the first flight, whichever ...of the following day, or your reservation will be cancelled. Once purchased, these tickets will not be eligible for cancellation under the...-flown reissued tickets, or to non-revenue tickets such as SkyMiles Awards. Miscellaneous: Cancellation request does not ...
Requesting Medallion Upgrades
...availability, time before departure, fare class purchased and SkyMiles level. Request a travel companion upgrade ... require payment of a change fee and/or any difference in the applicable fare. There is a Direct Ticketing Charge for tickets purchased from Delta over the telephone, at an airport, or.... Travel agents may impose an additional service charge for ticketing. Upgrades do not affect SkyMiles ...