I just tried. I am seeing the same behavior you are on the website. In the app, it brings up cash rates instead of points rates. Since Lexington, KY appears to have high rates in general that night, I suspect there must be a special event in the area and you maybe out of luck. Last time I saw similar behavior is when I was booking rooms for the Boston Marathon last year. Some properties would consistently show as available on points during the general search and then once I selected them, no award rooms were available. I never did figure out the cause. We wound up making different arrangements and it became a moot question. Good Luck! If you do figure out the root cause, please share it here.

--Jon