AC analyses issue in ADE

HI all,

when I do the ac analyses in the ADE in cadence IC 5141, I set the dc and ac magnitute properly, but I found the node current equation was not satisfied in AC simulation. As the pictures shown below, for example, the sum of the curren in v2, v3 and v4 is not zero! But they all share the same node, is something wrong in the simulation ?

Please help me out.

Thank you in advance!!