A few MM's are doing stuff to flash different Sizes with your broker. If the MM your broker uses is treating it unsolicited (which they probably are) you will get flashes of two different size numbers for example like what is happening now or a 10,000/20,000 number or something looking like this 1,010,000.
Right now they are trying to bring down the Bid Size to entice downward pressure even though buying is outpacing selling a little bit so far today.