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Don't hold your breath waiting for a feedback, Hantek's staff is too busy rushing to release a new buggy half-finished product or simply don't care.
The voltage offset in the channels is an inherent problem of this device, I reported it some time ago, never got an answer: https://www.eediscuss.com/forum. ... 2&fromuid=26055
I called the attention for the problem again in another thread, while solving a problem in a different product: https://www.eediscuss.com/forum. ... 8&fromuid=26055
Others also noted that, again, no solution: https://www.eediscuss.com/forum. ... 4&fromuid=26055
This "lifting" you call in the traces (offset) is normal in the oscilloscopes but it should be compensated during the calibration. For me, the offset changes depending on the volts/div setting, number of channels on or if the charger is connected. Running the calibration while charging yields the best results for me, try it to see if it improves in your case (leave the device on for about 15min to warm up before the calibration).
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