jqGrid sort icon displayed when no sorting performed

Question

In our grid we do not have sortName or sortOrder defined but the first column has the sort icon displayed (in ASC order). How can you prevent the sort icon from appearing?

---

Update: Code below

  $("#list").jqGrid({
    url:'NoData.json',
    datatype: 'json',
    mtype: 'GET',
    colNames:['Product', 'Type','Expiry', 'Put Call', 'Strike', 'Account','Long','Short', 'Open Qty', 'LTD', 'Operations'],
    colModel :[
      {name:'product', index:'product', width:75},
      {name:'type', index:'type', width:50, align:'right'},
      {name:'expiry', index:'expiry', width:60, align:'right'},
      {name:'putCall', index:'putCall', width:65},
      {name:'strike', index:'strike', sorttype: 'float', width:70},
      {name:'account', index:'account', width:70},
      {name:'long', index:'long', sorttype: 'int', width:55, align:'right'},
      {name:'short', index:'short', sorttype: 'int', width:55, align:'right'},
      {name: 'openQty', index:'openQty', width:80, align:'center', sortable:false, search:false, formatter:closeoutFormatter},
      {name:'LTD', index:'LTD', width:65, align:'right'},
      {index:'operations', width:105, title:false, search:false, align: 'center', formatter:opsFormatter, sortable:false}
    ],
    onPaging: function (b) {
        var nextPg = $("#list").getGridParam("page");

        if (dirty == 'false') {
       currPg = nextPg;
           return;
        }


    $( "#dialog-confirm" ).dialog({
        resizable: false,
        height:160,
        modal: true,
        buttons: {
            "Stay on current page": function() {
                $( this ).dialog( "close" );
            },
            "Change page": function() {
                $( this ).dialog( "close" );
                reloadGrid($("#list"), null, nextPg, 'false');
            }
        }
    });

        $("#list").setGridParam({page:currPg}); //Workaround - jqGrid still increments the page num even when we return stop so we have to reset it (and track the current page num)    
    return 'stop';
    },
    pager: '#pager',
    scrollOffset:0, //No scrollbar
    rowNum:15,
    width:'100%',
    viewrecords: true ,
    caption: 'Positions',
    height: '360',
    hidegrid: false //Don't show the expand/collapse button on the top right
  }).navGrid("#pager",{edit:false,add:false,del:false,
    beforeRefresh: function(){
        reloadGrid($("#list"), null, 1, 'true');  //Required so that we go to the server and not reload local data
    }
  });

Answer 1

Add sortable:false to that column's model config.

Answer 2

I modified a code example which you already know and commented sortname and sortorder. Now we have a grid with no sort icon displayed like you want. Look at here. You can also use sortname:id as an another option with the same result. So if the behavior of your grid is another one: post a code example.

UPDATED: After you post an example everything is clear. I use rownumbers:true in all my grids just I like it. If you add the option rownumbers:true to your grid you will see no sorting icon on the header of the first column. If you do not need the row number column you can use

$("#list").jqGrid('hideCol','rn');

to hide it. As a result you will have exactly the same grid as without rownumbers:true, but also without sorting icon on the header of the first column.