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TPS731: The out voltage of TPS73115M is wrong

Part Number: TPS731

When the voltage of AI2_IN+ to AI2_IN- is over 1 V, the voltage of TPS73115M is over 1.5V. So the out voltage of amplifier circuit is wrong.  Please help me Analyze why the the voltage of TPS73115M is not 1.5V  ,thank you.

the voltage of AI2_IN+ to AI2_IN- the voltage of TPS73115M
0V 1.5V
1V 1.5V
2V 2.68V
3V 3.35V
4V 3.61V