After further exploring, it seems that the double zoom issue on mouse scroll appears only after I add the NavToolBar [ZoomBox]. I looked into the NavToolBar.js file, and Navigation() control is been initialized here as well. I had already included the Navigation control while defining the map. When I delete Navigation control which I had defined, the zoom issue on mouse scroll is fixed. However, I have no control about enabling/disabling mousescroll event on NavToolBar, as it does not have any property like, zoomWheelEnabled. I think this is a bug with the OL code, and need to be resolved.
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