There's another thread on the forums here about this. Southwest's systems seem messed up. I tried reporting it to them via Twitter/X and they said they'd send it to the Tech Team, but it's still broken for everyone. I can't say I'm surprised - they don't seem keen on actually fixing things when they break.
Other thread: https://community.southwest.com/t5/Reservations/Southwest-Flight-Schedule-Change-not-giving-option-to-change/td-p/174071
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