Can't see anything wrong with your list per ce, the only thing is that you are missing timing. Who sold into the close and at what time was the bulk of Citigroup (-181,500) released?

Can't think of a reason why anyone would want to sell out now, especially, unless they are forced to, or have found some other place for their money, but overall if we had a positive volume day regardless of the lower close price, should pick up again today.