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1NA118 Amplifier

Hi,

Trying to understand the behaviour of the 1NA118 amplifier.

 When my Posive Vin is 538mV and the Negative Vin 527mV (Delta 11mV), I am getting unexpected amplification values (Rg tested 0.2K to 5K). However, when I set the Vin such that I have a differential of 22mV, with the same Rg values as previously, the results are within the expected range.

The signal is generated from a 20KHz AC source.

Could anyone help please?

Thanks