Sometimes they'll show ridiculous prices due to a scheduled event. (This was happening last time I was planning a trip, and I called to ask why 2 of the 3 nights I was looking for, they were listing Dolphin standard rooms at 5 times the usual nightly rate!) They told me they do this in order to discourage bookings during conferences and other large events and that such an event was indeed scheduled for those 2 dates that were showing up at sky-high rates, although I can't begin to fathom why they don't simply block off the rooms they think they'll need in the first place, instead of pretending to offer them at prohibitive rates.
They told me the rates would drop down to the normal ones shortly beforehand, if there was availability after all the conference bookings were completed. Indeed, that happened a couple of weeks before we traveled, although by then, we'd been booked for months somewhere else and had no desire to switch.
I can't say whether what you're looking at is a similar situation, but if you really want the Swan/Dolphin, I'd suggest checking back periodically to see if the rates have gone down (or if
AAA or other discounts for which you're eligible have opened up).