asp.net - Gridview not supported in Firefox and Chrome -

<cc1:tabpanel id="tabpanel2" runat="server" headertext="assigned me">                                 <contenttemplate>                                     <table style="width: 950px; max-width: 950px;">                                         <tr>                                             <td style="width: 933px">                                                 <asp:panel runat="server" id="pnlasgntome" width="100%">                                                     <asp:gridview id="grdthread" skinid="gridy" runat="server" autogeneratecolumns="true"                                                         width="99%" datakeynames="thread_id" onrowcreated="grdthread_rowcreated" cssclass="grid-view"                                                         onrowcommand="grdthread_rowcommand" allowpaging="true" onpageindexchanging="grdthread_pageindexchanging"                                                         pagesize="20" allowsorting="true" onsorting="grdthread_sorting">                                                         <columns>                                                             <asp:templatefield headertext="select">                                                                 <itemtemplate>                                                                     <asp:linkbutton id="linkbutton1" runat="server" commandargument='<%# eval("thread_id") %>'                                                                         commandname="select">go to</asp:linkbutton>                                                                 </itemtemplate>                                                             </asp:templatefield>                                                             <asp:boundfield datafield="title" headertext="title">                                                                 <itemstyle cssclass="gridtext" wrap="true" width="400px" />                                                             </asp:boundfield>                                                             <asp:buttonfield datatextfield="reportedby" headertext="reported by" text="reported by" />                                                             <asp:boundfield datafield="status" headertext="status" sortexpression="status">                                                                 <itemstyle cssclass="gridtext" />                                                             </asp:boundfield>                                                             <asp:boundfield datafield="type" headertext="type" sortexpression="type">                                                                 <itemstyle cssclass="gridtext" />                                                             </asp:boundfield>                                                             <asp:boundfield datafield="created" headertext="created" sortexpression="created">                                                                 <itemstyle cssclass="gridtext" />                                                             </asp:boundfield>                                                             <asp:boundfield datafield="modified" headertext="modified" sortexpression="modified">                                                                 <itemstyle cssclass="gridtext" />                                                             </asp:boundfield>                                                         </columns>                                                         <editrowstyle bordercolor="#404040" borderstyle="solid" borderwidth="35px" />                                                         <pagersettings position="topandbottom" />                                                         <pagerstyle horizontalalign=" right" />                                                     </asp:gridview>                                                 </asp:panel>                                             </td>                                         </tr>                                         <tr>                                             <td style="width: 933px">                                                 <asp:label id="lblasgnnodata" runat="server" text="label" visible="false"></asp:label>                                             </td>                                         </tr>                                     </table>                                 </contenttemplate>                             </cc1:tabpanel> 

this aspx page run i.e. fireflox , chrome not work.gridview's showing first column header text , onthe column out of page.