AC current measurement problem

[Muhammad Nasar]

I am working on a circuit to read AC voltages and AC current value through a micro controller for which i have made the following front end circuit. The voltage measurement doesn't have any problem, but the current measurement through 1 ohm shunt resistor is giving asymmetrical waveform rather than a sinusoidal one, one thing i have observed that if I place the shunt resistor at the low side then this problem does not occur!
schematic is attached.
suggest me a solution.

[Andy Watson]

When you put the 1R in the high side the common mode voltage exceeds the range of the op-amp (several times over). Consider the voltage that appears on the positive input of the first op-amp (pin 3?), I make it about 115 V rms, or 160 Vpeak. Under these conditions the op-amps no longer behave as you expect.

[Paul Price]

Andy has got it right, you are overloading the inputs of the op-amp because of the common-mode voltage.

[Muhammad Nasar]

Thanks a lot, guys.