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When i sort a column in IE 11 i get a extra column in the header. How do i remove that?

<telerik:RadToolTip runat="server" ID="EditPhotoToolTip" EnableEmbeddedSkins="False" ShowEvent="FromCode" HideEvent="LeaveToolTip" Sticky="true" Animation="None" Position="BottomCenter" RelativeTo="Element" Width="340" Height="150" Skin="Default" ShowCallout="False" ContentScrolling="None" OffsetX="0" OffsetY="0" HideDelay="0" AutoCloseDelay="0">... Content... </telerik:RadToolTip> function ShowEditToolTipBox(pTarget, pFotoId, pComment, pName, pShow) { toolTipCtr.set_targetControl(pTarget); if (pShow) { toolTipCtr.show(); }