Why does the circuit composed of AD834 measure different power values, please he

[daisizhou]

The schematic diagram of the circuit is shown in the figure below. AD834 and AD711 form a square circuit。Of course, there is a filter circuit in front of。Two groups of AD820 form a ten-fold amplification and a hundred-fold amplification circuit。TP4\TP5\TP6 are respectively connected to the analog switch and finally connected to the AD converter。The AD converter is then sent to the microcontroller for processing and calculation。
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I use the signal generator as the signal source, set the 500K sinusoidal waveform signal 224mVrms voltage value input, and input it at the RF IN port
2 identical A and B boards, why do I get 2 different sets of test data, I don't know why, if you know please tell me the reason
Thank you for your help