AD5520:trouble with MEASOUT voltage range

HI this is my sch of ad5520. the pin 64(CLL) vee_3v3 is -3.3V and pin 63(CLH) vcc_3v3 is +3.3v.

I change the pin 26(FIN) voltage , the pin 58 (MEASOUT) should from -3.3V to + 3.3V . but the pin 58 (MEASOUT)  is -0.256V to 3.3V.

the R74 is 100K. and in force current mode

why the pin 58 (MEASOUT)  is -0.256V to 3.3V.

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