The RadGridView is not aware of the of the changes made in the Row Details and that is why it does not sort according to the new edited items in the Details View. So, you need to add property RowDetailsVisibilityChanged="playersGrid_RowDetailsVisibilityChanged" in the definition of the grid view in the xaml file, which will call the method:
private void playersGrid_RowDetailsVisibilityChanged(object sender, Telerik.Windows.Controls.GridView.GridViewRowDetailsEventArgs e)
Thus RowDetailsView alerts the GridView for the changes and commit them, which results in correct sorting.
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system and vote to affect the priority of the items.