I would keep checking or play around with their flexible date booking option if your dates are flexible. I started looking at Swan/Dolphin rates a few weeks ago and also thought it was a glitch, however, it now appears they are raising prices as room availability diminishes - kind of like a "surge" pricing approach. When I first looked, the rates were about $900 a night (this is for this upcoming weekend). I kept checking and, eventually, I was able to get a Marriott member rate of about $250 per night at the Dolphin (with taxes and resort fees). But, like you, when I went back to check again, the prices surged back up into the $700-$800 range. Just keep checking and if you find a rate you like, lock it in immediately!