AD8626 voltage noise issue

Hi Experts,

I am testing a circuit that TIA pre-amp used AD8626.

I used Fig45 of spec page15 topology, and 2 OP are used.

I used same opto-diodes in the -INA and -INB inputs.

As I thought, the voltage noise of 2 OP should be same.

But the test shown the noises are different, how about is it?

Is the same bias circuit used for 2 OP core, the interference is generated?

Thanks for your support!

B&R

Tom