How to fix mouse moving on its own

This has been happening since I got this tablet back in 2024 and idk how to fix it as you can see in the video the tablet keeps on moving my mouse to the bottom right screen on its own even after I tried to update the software, switch the cables and reinstall the software the issue keeps on happening and I tried to look inside the tablet for the issue and I couldn't go deeper without knowing what to even do like istg I tried everything from fixing the pen to looking everywhere on the Internet for a answer.

Edit: I found out that this problem seems to be a glitch that is caused by a power cord issue that happens when it's not plugged in fully so the only fix is that I replace the power cable but I don't know where to find one online.