We've investigated the problem and it seems to be related to VisualStateManager, the Mouse Over VisualState and InternetExplorer 11. I was also able to reproduce it with the Microsoft DataGrid.
What we can suggest as a workaround for RadGridView is to edit the GridViewRow's template and remove the part for MouseOver state. The cons of this solution would be that the GridView will not have any style applied on mouse over.
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