Page scrolls down arbitrarily, please check it out on your side:
1. Open JSFiddle example or somewhere else;
2. Zoom in page up to 125%(in case of 1920×1080 screen resolution);
3. Make sure that the page scrolled up to the top
4. Right-click to any cell;
5. Move out mouse pointer outside of the menu;
Result: page scrolls down
Thank you for reporting the issue and for providing the example.
It helped us reproduce the described behavior on our side.
We will investigate the problem and provide you with results ETA Nov 30.
Feel free to reach out in case any additional questions arise.