The lead is lead pf CUMULATIVE SCORES (Scores and leads of previous rounds matter)
Please read second table given in Q carefully. And please give forums a search before opening new Q. Its answered multiple times today itself.
thank u ! its my mistake 
Hey dear, please dont use award point feature as it subtracts your karma. When a user finds a answer acceptable, he “acccepts” the answer by clicking on the “tick-inside-circle” below the “thumbs down” button to the left. It also awards you with 2 karma points. Thats how community grows