Op Amp Offset Voltage

I’m using TIA for measuring a light intensity by a photodiode. I add a voltage divider to non-inverting input of op amp (MCP601). When I use circuit without offset voltage, there is not any ripple. But when I add offset voltage ripple is seen. I think Vss has ripple and cause to add it at output. how can I avoid from this issue?
Series a cap at op amp Vss with ground??

Thanks a lot

op amp.png

Post a schematic diagram, and some evidence of the problem.

schematic diagram is attached to original post

What is the purpose of C1 and R2, and why are they connected in this very strange way?