So far, I have tried three different mouse-scrolling devices, all wireless, that work with my laptop. I have reset my computer. I tried the battery switch. (Duracell, good until 2031.) I switched USB ports too. I tried turning off the scroll lock from the software keyboard. No joy.
With no offense meant to those who have succeeded, so far it feels to me like the suggestions are in the same vein as snapping your fingers to keep the elephants away. Try it. See there are no elephants for a thousand miles! That is, confusing cause and effect. I am glad the above have helped for some.
It seems to be Excel and Sheets, but even the screen before the PIN screen scrolls.
Microsoft store scrolls too.
In Sheets, neither the scroll bar nor the scroll arrows will bring the page more than half-way to the beginning of the sheet.
I don't think there was a Win10 update recently that would explain it. Even the settings windows are scrolling and won't stay where I want them.
Clearly, I need help. I would prefer an explanation of what and why this started happening.