Why did Liu Xiang rank ninth in the track and field world championships?

In the final, there are 8 players, and the 4 th, 5 th, 6 th and 7 th levels are occupied by the first place in 3 groups and the second place in the best group. These 4 levels are also lottery. So Shi can rank sixth and Payne seventh. The other four racers randomly selected four tracks 2, 3, 8 and 9, so Liu Xiang "unfortunately" won the ninth track. The process of making the pass was in line with the regulations, and Liu Xiang was not wronged.