[Mp4-tech][H.264] PSNR is higher than JM??

[Ann]

Dear experts,
I am doing research on H.264 intra prediction. 
And there is a strange result when doing simulation. 
In the simulation results why the SNR values (Y, U, V) are higher than JM software.
Although the SNR are higher but the bit rate is more than JM.
This is different with what I think.
If the SNR is better than JM then bit rate should become less compare to JM.
But why the result is different.
Can anyone correct me what happened here?? Or is there any method to estimate these 2 values (SNR and bit rate).
Thanks in advance!
Rest regards
Ann
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