which pool works properly

?? in most pools, I get 3.2kh / s displayed although I would have in cn-V7 algo 6,4kh / s.
Cn heavy and cn lite / v1 coins show the correct value

You must understand that the shown hashrate won't affect your payout. This is just statistic of the accepted shares for 5 or 10 minutes. It might be more or less than your actual hashrate.