I know exactly why. It's probably due to the fact that my first two DAT scores we a 16 (2010) and a 17 (August 2013). I got my act together and retook it in November and got the 21 I mentioned earlier. So by November, it was kind of late for some schools. ECs were above par in my opinion. I also had research for the first half of my Master's degree, and worked 30 hours a week for the latter half of my degree.