This does happen occasionally, but this time is a little weird. FDP are completely blocked off for September 8 & 9, there's a ton of availability on September 10, and then completely blocked off again September 11, 12, & 13. Could be a weird glitch, could be that reservations just haven't been loaded into the system yet, or could be that something else is going on that just hasn't been announced yet. Time will tell!