op amp emitter follower buffer offset
The emitter follower can only source current, it cannot sink it*. The LM6132 has an input bias current of (typically) 110nA at room temperature. That current flows out of the op-amp input. 

If you connect it to a 500K load to ground, you'll get around 50mV of output offset. To make this go away you could add an E-B resistor- something like 1K should work very well.  

*If you had a -10V supply it would probably appear to work since the transistor E-B junction would break down. This is not a good thing. Even with your +/-5V supplies it would be a good idea to add a reverse-biased diode such as a 1N4148 across the E-B junction (in parallel with the resistor I mentioned above).