ADG5462F is not giving output as expected_required immediate support

Dear Analog,

We have used  ADG5462F part in our design as ADC Channel protector.  We are facing issue with its functionality as we are not getting expected output for the applied input. 

Eg: When we are giving 6V as input, we are getting some random voltages at its output.  Some channels are giving 9.9V, 11.25V . 1.2V, 0,3V for the same 6V  input.

Schematic is attached for your reference.  Could please suggest what could be the root cause for this issue. Same ADC is working for differential Channels where we have not used this protector

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