I found the inconsistent behavior (Focus moved at a different place) of selecting the cell in Rad grid for IE Browser.
As I had 15 columns displayed in my grid. So, I get horizontal scrollbar definitely.
For selecting any cell of the last column I scroll horizontally and try to select any cell.
As soon as I click on any cell the scroll reset to its default position although the cell would be selected.
PS. This will only happen if I had set property ## AllowKeyboardNavigation="true" ##