jQuery Grid Plugin - jqGrid

I apologize if the problem is already solved. but I could not find solutions

After the table updates
using $ ('# treegrid'). trigger ('reloadGrid');
  open section is closed and no longer opens properly.
Only helps the full restart page.

first
1
--- 3
--- 4
--- 5
2

open sub-section (JSON)
1
--- 3
--- 4
--- 5
------ 6
------ 7
------ 8
2

and after the $ ('# treegrid'). trigger ('reloadGrid');
1
--- 3
--- 4
--- 5
2

and then opening branches does not work

i tried  setGridParam datatype JSON

no result.

 jqueryGrid 3.82.

jQuery("#treegrid").jqGrid({
 treeGrid: true,

 treeGridModel: 'nested',
 ExpandColumn : 'total',
 url: 'module/json/tree_json.php',
 datatype: "json",
 mtype: "POST",
 colNames:["id","name","","",""],
  
 colModel:[
  {name:'id',    index:'id',   width:50,  align:"center", key:true},
  {name:'descript', index:'name',   width:500, align:"left"},
  {name:'total',  index:'name',   width:150, align:"center"},
  {name:'total_used', index:'acc_num',  width:150, align:"center"},
  {name:'chdate',  index:'acc_num',  width:150, align:"center"}

 ],  
 
 treeReader : {
     level_field: "level",
     left_field:"lef",
     right_field: "rig",
     leaf_field: "isLeaf",
     expanded_field: "expanded"
 },
 
 onSelectRow:   function(id){rightclicid=id;},
 onCellSelect:  function(id){rightclicid=id;},
 onRightClickRow: function(id){rightclicid=id;},
 
 rowNum:500,
 altRows : true,

 height:'auto',
 pager : "#ptreegrid",
 jsonReader : {repeatitems: false}, 
 toolbar: [true,"top"],
 footerrow : true,
 rownumbers: true, 
 loadonce:false,
 multiselect: true,
 multiselectWidth: 100,
 prmNames:{oper:'do',editoper:'changeshowid'},
 caption: "Разделы сайта"
});