Hantek DSO5202BM: Confusing vertical shift waveform.

Oleg10011001

There is a strange shift in the vertical waveforms obtained from the second channel when the oscilloscope is set at more than 2V per cell. For example, look at the waveform in the following screenshots. In all of these cases, both the probe was connected to a generator, oscilloscope calibration, and both channels markers moved strictly in the center of the screen by pressing the corresponding "Vertical position".

Oleg10011001

Thanks, this helped!