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OPA2365: Opamp output going to rail voltage

Part Number: OPA2365

I am using a OPA2365AID opamp in a voltage follower configuration. It is being powered from a 3.3V supply ( +3.3VH_ISO). The input to the opamp is coming from an ADG706BRUZ-REEL7 MUX which is being powered from a 5V supply ( +5VC_ISO).  The purpose of the MUX is to monitor the voltage supplies on the Board.  One of the voltages being monitored (SNS_3V3C) on channel S2 happens to be the voltage supply of the Opamp but it is stepped down to 2.65V via a resistor divider.  The issue which I am seeing is that the output of the opamp is railed to 3.3 V only for signal SNS_3V3C yet the voltage out of the MUX and into the Opamp are 2.65V.