Using The ADA4177-2 as a buffer, outputs don't exactly follow inputs

Hello,

I just took over an amplifying circuit board on which the last stage is a buffer circuit with ADA4177-2 for two signals. My problem is, there always exists a difference of 0.07V between the buffer input and output. My current input signal is around 1.1V~1.5V. The power supply is V+ = 2.5V and V- = -0.2V, not symmetrical. I am wondering if this is the reason for the deviation?

Many thanks in advance!