Let me be more clear to see if the description fits your situation: you open a folder in your File Explorer, let say, to see the pictures. After you finish viewing the first screen of the pictures, you want to scroll down a little bit to see more, but you find the scroll bar on the side won’t budge, it just keeps jumping to the top position no matter how many times you roll your mouse wheel.
To solve this problem, you just need to do the following moves.
1) Follow the path: Start button > Settings > Personalization.
2) On the left side of the pane, choose Colors, and the on the right side of the pane, make sure the option Automatically pick and accent color from my background option is slide to Off.
There you go, problem solved.
The problem will also be gone if you reset your desktop wallpaper from Slideshow to a static picture. If you are still having this problem, it’s always worth a shot.