Putting this here so others can find a solution if needed
So, for the past week or so, the context menus (and only the context menus) on Windows 10 have been continually scrolling nonstop. Everything else is fine, just the context menus.
I checked the following:
User account settings.
Rolled back updates
None of it worked.
Then I noticed my XBOX controller, connected to my PC, was upside down, and one of the thumbsticks was being tilted. I turned it rightside up, and it stopped.