Cgminer low hashrate

[Blisk]

I noticed one thing on one miner.
On cgminer I have all the time hashrate about 224 Khash
But on pool ti shows only 60 Khash
And than I noticed that miner have really small amount of jobs.
like every one else have new job every fev seconds this one just every 10 or 15 seconds and hashrate is almost the same on all 224 Khash.
What can be problem that this one dosen't have more jobs and so low hashrate on pool?