Chances are Google have deemed these 2 clicks as suspect and have not counted them as legit. Happens to me all the time!
google count this 2 click as invalid click, It`s happened to me be careful to much invalid/fraud click will lead to account suspension
It's possible that the clicks were not worth anything, or that the click was coming from a known "spammer" IP. Remember that Google NEVER discloses how much each click is worth....and there will be many that don't generate revenue.