I have booked FB awards on Delta 3 times in these 4 months and every time (no exception) I had the same experience as you. I thing that they show on page 1 which tickets are available at a certain moment of the day (i.e. in the morning) and that page 2 is completely automatically (completely linked to the booking systems).
In my case I always check different dates, click through to page 2 and 3 to be sure of availability and which price it really is. As result I found one-way Delta tickets from SFO to europe for as low as 25000 miles and €16 (I flew one yesterday), although at page one that was not indicated as FB of course favors filling AF/KLM seats and making a profit out of us (klm/af seats are 25000 miles and €200+ ).
Advise: check a few days in a row as availability changes ( certainly on Delta which has a terrible booking system, check delta skymiles blog).