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LM8481测电流问题?

Other Parts Discussed in Thread: LMP8481

用的LMP8481测电流,固定增益为20,电路图如图: ,REFA为5V,分别测同向和反相电流,结果出现两个问题:1,测得输入输出的增益约为7,与20相差很大 ?;2,如果不在输出端加滤波的话,输出噪声较大,电路电源已经做了充分滤波,请问这是什么问题 ?