Wow, I'm suddenly feeling much better about the cost of my vacation package. The news just had a story this week about all the travel bargains to be had because so many people were electing not to travel this year, so hotels and airlines are offering discounts just to get people in the door.
It could be that the previous price was for a standard room and now they are sold out and you are getting a quote for a suite or concierge room. Check your room type; the rates generally do not change for the same type of room for the same dates.