jqGrid with multiselect:true and reloadGrid double checkbox column - jqgrid

Question

The column for multiselect is saved in the grid param and when I reload the grid using a saved state(getGridParam) I get a double column for selection that messes up my column order.
My grid before I load param
After
here is the code :
jQuery("#list2").jqGrid({
url:'jqgrid/server.php?q=2',
datatype: "json",
colNames:['a','UID','Phone', 'Message', 'created','replyed'],
colModel:[
{name:'action',index:'action', width:55,search:false,'sortable':false},
{name:'id',index:'uid', width:55},
{name:'phone_number',index:'phone_number', width:90,'editable':true},
{name:'message',index:'message', width:500,'editable':true},
{name:'created',index:'created', width:80, align:"right",'editable':true,stype:'select',edittype:"select",editoptions: {value:"Yes:Yes;No:No"}},
{name:'replyed',index:'replyed', width:80, align:"right",'editable':true,edittype:"checkbox",editoptions: {value:"Yes:No"}},
],
rowNum:50,
toolbar: true,
height: '100%',
width: 800,
rowList:[10,20,50,100,300,1000],
pager: '#pager2',
sortname: 'uid',
sortable:true,
viewrecords: true,
sortorder: "desc",
caption:"Pilote",
gridview : true,
multiselect: true,
});
function saveStateGrid(){
state = $('#list2').getGridParam();
localStorage.setItem("gridState", JSON.stringify(state));
}
function loadStateGrid(){
state = JSON.parse(localStorage.getItem('gridState'));
jQuery("#list2").GridUnload("#list2");
//state.multiselect = false;
$('#list2').jqGrid(state);
$('#list2').trigger('reloadGrid');
}