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Strange Error in post-simulation using pex & Spectre

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weirongcheng

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I was simulating a differential amplifier with source degeneration. B9]`[SH6PJB][GV7`5BAM0Y.jpg. I extract parasitics of M4,and add it in the circuit then do the post simulation. The current of M5 is 10uA. The current of M4 is 80uA during the presimulation, but the current of M4 is 592uA nearly the 8 times of the presimulation during the post simulation, each finger in the post simulation carries the whole current of M4 ! what is wrong with me ?
who can help me ? Thanks in advance!!!!
 

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    1`G_`MJIO_6YWYCMZ}VSEKK.jpg
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I am sorry the figure attached is wrong! Here is the right figure!B9]`[SH6PJB][GV7`5BAM0Y.jpg
 

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