No idea, but I've seen a lot of people in other places complaining about something, and I thought I'd just throw this out there in case anyone didn't figure it out for themselves:
NEVER buy anything at a normal discount during a steam sale until the last day, because it might be one of the daily deals later in the sale. Some people are freaking out because they bought Skyrim for 33% off, and today its 50% off. That's just how these things work. Wait for a better deal, and if there isn't one by the 23rd, then buy it.