Simple circuits in Multisim

[Sheldoniq]

Let's have a simple circuits as on Picture.

V3 is source 1Vpk 100kHz , this make over blocking capacitor C4 current over C3 1nF.

Probe PR4 say Vrms on C3 is 707.073mV , current over C3 is Irms = 450.072uA

Xc3=Vrms/Irms= 1571.02 Ohm..

Where is problem?

Xc=1/(2 * Pi * f * C ) = 1591.55 Ohm

Her is 20 Ohm difference and PR4 say on C3 is Vdc 84.93 uV

DC voltage between two capacitors?

Can someone explain it to me?