AD8232 REFIN and REFOUT with different values

Hi everyone,

I've draw a circuit where I use AD8232 to make an EMG. My circuit is working as expected and the output signal is right. However there are one thing that seems to be strange. The REFIN port has a different value of REFOUT. At REFIN I've 1.2V and REFOUT 1.6V. 

To solve this I'm thinking about using an external voltage buffer to create the reference point. Yet, this option make my use more components what its not worth it. 

Best regards