Linq query not bringing latest record on two table

Dear All,

   The following query has not to return the latest records based on the record updated time. it brings the records wrongly. 

List<int> resp = new List<int>() { 2, 3};
var list = from a in _context.Vip_Event_Resp
join c in _context.PA_Event_Resp on a.Vip_Id equals c.Vip_Id into qry
let r = qry.Where(x => x.Vip_Id == vipId && x.Event_Id == model.Events.Event_Id && resp.Contains(x.Response)).OrderByDescending(x => x.Updated_On).DefaultIfEmpty().
FirstOrDefault() select new { r.Vip_Id, r.PA_Id, r.Response, r.Updated_On };

TABLE: Vip_Event_Resp

Id Event_Id Vip_Id Response Response_Text Created_On Updated_On

7 F43FCC27-2726-4775-939C-23E3B322BB63 03C72650-D05F-4E7B-B491-4A0DF05B689A 2 NULL 2020-01-07 14:29:21.093 2020-01-07 14:29:21.093

TABLE: PA_Event_Resp