I know the waveforms and if both channels are driven with the same waveform, offset, phase and frequency, but only channel1 behaves different. You recommended me to adjust the oscilloscope, ignoring the evident clipping above 22volts on the pictures.

When you set the generator with 20V, it is normal that oscilloscope test out 22V.
Since the waveform have kurtosis, the oscilloscope usually test out the maximum kurtosis.

For example, we set generator with 5V,the oscilloscope test out 5.52V, the picture as below:

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