i have the following power supply circuit which i am simulating in proteus. how to calculate the current through the resistor R3?

as i understand, the primary input is 220V rms and peak of 311.12V, f=50Hz. the transformer has turn ratio 15. at the secondary before the diode the peak is Vs,in =311.12/15=20.74V, the peak voltage output from the diode D4 is, Vs,out = Vs,in-0.7=20.74V-0.7V=20.04V. And therefore the current through R3 should be, Id = (20.04V-12V)/1kohm=8mA because the zener diode D6 has zener voltage of 12V. The load current should be around IL = VL/R4= 12V/1.2Kohm=10mA but it is not so.
The ac voltmeter and the ac ammeter in the picture above are showing rms values.
So why is my calculation wrong?

as i understand, the primary input is 220V rms and peak of 311.12V, f=50Hz. the transformer has turn ratio 15. at the secondary before the diode the peak is Vs,in =311.12/15=20.74V, the peak voltage output from the diode D4 is, Vs,out = Vs,in-0.7=20.74V-0.7V=20.04V. And therefore the current through R3 should be, Id = (20.04V-12V)/1kohm=8mA because the zener diode D6 has zener voltage of 12V. The load current should be around IL = VL/R4= 12V/1.2Kohm=10mA but it is not so.
The ac voltmeter and the ac ammeter in the picture above are showing rms values.
So why is my calculation wrong?