Yes, please do try experimenting with unplugging mouse, keyboard, tablet if any, one at a time to see if any could be the culprit, at the moment its suspected to be more of a hardware issue somewhere. Would be a different case if other people were getting this too, and looking into the code doesn't seem to be anything causing a scroll, is all quite frustrating, but so far seems isolated x_x
If you try on mobile with the ads you're getting, same scroll or none?