I've seen the 7-day range cut down to a three-day range before when there have been website issues. It was temporary in the past and will probably be temporary again. I suspect it's them reverting to an older version of something, or disabling a program that enhances the built-in three-day search to include a seven-day window, or some other similar thing.

Maybe the website issue is why the fare display is odd, too, including the "surcharge". The markets I've been following closely are the same total fare as before.