What counts is that the correct hashes your mining software says it found is consistent with the number of correct hashes deebpit says it recieved.
the MH/s deepbit shows you is a based on calculating the correct hashes send in relationship with the current difficulty. I do not know the exact formula. Fact is your success against difficulty is fluctuating somewhat in statisical parameters.
The MH/s rate shown on your miner is actual hashes run.