Issue in RadGrid Export to Excel functionality

Hi Team,

      We are binding radgrid from server side,  and using default Export to Excel functionality. The problem area is when we export the excel we are getting Extra Words like "Sorted ascSorted desc" in Column Header along with Column Name. We have tried few related properties of export settings but failed to resolve the issue. For your reference attaching problematic excel screenshot and also grid settings below.

Please do needful as soon as possible.

Thanks.

            RadAjaxLoadingPanel RadajaxloadingpanelTestdata = new RadAjaxLoadingPanel();
            RadajaxloadingpanelTestdata.ID = "Radajaxloadingpanel_AccActWidget_" + WidMapID;
            this.Controls.Add(RadajaxloadingpanelTestdata);

            RadAjaxPanel panel_testdata = new RadAjaxPanel();
            panel_testdata.ID = WidMapID;

            RadGrid rgTestData = new RadGrid();
            rgTestData.ID = WidMapID;
            rgTestData.AllowPaging = true;
            rgTestData.AllowSorting = true;
            rgTestData.AutoGenerateColumns = false;
            rgTestData.ExportSettings.IgnorePaging = true;
            rgTestData.ExportSettings.ExportOnlyData = true;
            rgTestData.ExportSettings.Excel.Format.Equals("Biff");
            rgTestData.ExportSettings.HideStructureColumns = true;
            rgTestData.ExportSettings.FileName = "CountsOfTestsLoaded";
            rgTestData.ExportSettings.Pdf.ForceTextWrap = true;
            rgTestData.MasterTableView.DataKeyNames = new string[] { "VerifyDate" };
            rgTestData.MasterTableView.CommandItemDisplay = GridCommandItemDisplay.Bottom;
            rgTestData.MasterTableView.ClientDataKeyNames = new string[] { "VerifyDate" };
            rgTestData.MasterTableView.CommandItemSettings.ShowAddNewRecordButton = false;
            rgTestData.MasterTableView.CommandItemStyle.Height.Equals("22px");
            rgTestData.MasterTableView.CommandItemStyle.HorizontalAlign = HorizontalAlign.Right;
            rgTestData.MasterTableView.PagerStyle.AlwaysVisible = true;
            rgTestData.MasterTableView.PagerStyle.Mode.Equals("NextPrevAndNumeric");
            rgTestData.ShowHeader = true;
            rgTestData.ClientSettings.Selecting.AllowRowSelect = true;
            rgTestData.MasterTableView.CommandItemTemplate = new MyCommandItemTemplate() { IsRefresh = true, IsExcel = true, IsPdf = true, IsCsv = true };
            BoundColumns(rgTestData);
            panel_testdata.ClientEvents.OnRequestStart = "onRequestStartTestData";
            panel_testdata.LoadingPanelID = RadajaxloadingpanelTestdata.ClientID;
            this.Controls.Add(panel_testdata);
            panel_testdata.Controls.Add(rgTestData);