Same issue. Posted another thread about it. I can boot to android so I can say that it is not a physical hard ware issue as the screen works in android fine.
Watched the video, I don’t have a stylus pen, but yeah, that is pretty much what I am getting. My thread is titled “WIndows 10 Screen Messed Up”
Thus far I have tried to calibrate the screen, and I have also tried running the “chuwi-hi8_touch”, but that failed. I’m next going to try installing a different version of the OS. Wondering if it is something about the particular image I used.
I got mine working. not 100% sure how though. There are two files in the downloads section, one called Hi8 Touch and the other Silieadtouch. I downloaded those, extracted them both using WinRAR. One has two files in it and the directions say to place them in C;windows\system32, the other has a file that you have to run as an administrator. It rings up command prompt. I did both, although the command prompt one seemed to fail…but in any event, after doing both and doing a full shutdown, my touch screen is now working. Take that for what you will.