Either 1) Those fares no longer exist (despite showing up in an initial search, they've actually been sold to someone else -- unfortunately that's just how the Southwest website works); or 2) glitch. Try calling (1-800-435-9792). If the rep can see the fares they may be able to rebook you. Alternately, you can cancel for a full refund since it's been less than 24 hours, and then rebook at the new lower fare (if available). I'm not positive if you'll receive a refund of EarlyBird Check-In however, so if you've bought that as well it would be better to call. Good luck.
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