I've been playing for about a year now and the other day I decided to count my damage deck on a whim. I had 32 cards!
So I decided to go through and figure out which damage card I was missing and lo and behold I had 11 Direct Hits in my damage deck!
I never bothered to count it out before because I had always just assumed that I was cleaning up my cards correctly. I don't recall any instance where I could have messed my deck up (i.e. using someone else's deck or sharing a deck).
On the bright side I feel better about my playing skills since apparently I've been playing with a handicap for a while now