Strange problem with wpa2 hash breaking

[DrGeek]

Hi I am using oclhashcat to break my wpa2 hash but am facing a strange problem.i have captured the handshake of my router and was trying to break it but it is giving me strange results.i have made a random wordlist and placed the password in it but oclhashcatplus cracks it only when it is placed between the first line and the twentyseventh line.when it is placed below the twentyseventh line it fails to crack it and shows exhausted.why is it behaving like this?
My setup is
Win XP sp3
ATI Radeon 5670 w ati catalyst 12.1 w opencl 858.1
Password length is 14 chars
Oclhashcatplus 0.08