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TLV3691: Input impedence abnormal

Part Number: TLV3691

Hi team,

My customer is using the TLV3691 as a comparator to monitor the voltage from a Potential transformer (PT). The negative input of TLV3691 is connected to the PT output and the positive input of TLV3691 is connected to a reference voltage. When customer is doing the test, they found that the input impedance of the negative input is abnormal. The input impedance is only several ohms instead of several Mega ohms. I already checked with customer that the negative input voltage is within the range from GND to VCC. Do you have any comment on what may be the reason of this input impedance issue? 

Best regards,

Wayne