Thanks. But can you please share the entire screen screenshots(in both cases) so that I can see the div, classes on which the CSS is applied.
Also, check if this scrollbar is coming on a section. To confirm that in a div element, you should see a node_name attribute whose value will be the name of the section. For example, a section name is "Testscroll", the attribute will be <div node_name="TestScroll">
Attaching the corresponding snippets from both IE and Chrome.
Also, please find how the scroll bar looks like in IE in IE-Scroll.png. The Scroll bar is highlighted (in Yellow) in the image and that ends there. But there are contents below it in the screen which can not be scrolled.