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INA333: gain is not as expected

Part Number: INA333


I'm using INAEVM-MSOP8 to test INA333 with below configuration. V+=2.5V, V- = -2.5V. REF=0V, RG=1K, which sets GAIN=100.

Although IN- is not connected to GND, but I measured the common mode voltage is only 0.6mV.

IN+ -IN-,  OUT=112mV

3mV 111.1mV

6mV 111.4mV

9mV 111.6mV

Then I tried from IN+ - IN- from 1mV to 10mV, OUT is always around 112mV.

What's wrong here?