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INA122放大的问题

Other Parts Discussed in Thread: INA122

本人搭建了一个氧气传感器放大电路,利用的INA122 双电源供电,正3.2V左右,负1.3V左右,Ref接地,调整放大倍数为105倍,传感器在室内输出恒定12mv的电压,可实际直接输出2.8几V的电压了,明明软件仿真是正确的。下面是我的仿真图和原理图。之后我把两个输入口短接并接地,按理说应该输出0V左右,但实际却有0.9V的输出,请问是怎么回事