OPA1642: OPA1642 buffer input bias voltage drop

Part Number:OPA1642

Hi. 

I have problems with the bias voltage of a buffer circuit. 

I can´t manage to make the bias Vin/2. My supply is 5V. And I have tried to adjust R2 with a higher value,

but even with 5V out of the voltage divider the bias voltage won´t go over 2.1V.  (See att.)

What is wrong with the circuit? Why is the input current so high? According to the datasheet the input bias current should be around 2pA.

I also tried with a input impedance of 470k (R3), but I still couldn´t get it over 2.2V.

Are there any problems with attenuating the output back to the voltage devider? I thought that would work as a virtual ground with sink/source capability.