Signal conditioning for PIC inputs

[bobx]

Hello,everybody.I designed a circuit to measure 3 sinusoidals 50HZ voltages[V1,V2,V3]
and 3 sinusoidals 50HZ currents[I1,I2,I3] with PIC18F452/PIC18F8722[XTAL=20MHZ].
I applied all those voltages and currents directly to the inputs of that PIC.

But on the GLCD I have only 0 or have two values that are not correct;when I apply
DC instead of sinusoidal,on the GLCD I have corrected values.
So,what is the reason for that behaviour? If the reason is related to signal conditioning would
you please give me an example for that?

Thanks,