ХП возвращает разные данные в дебаге и при выполнении

select MO,TU,WE,TH,FR,SA,SU from time_table where
      time_table.start_date =
      (select max(start_date) from time_table t1
       where t1.routes_id = :id_route
       and t1.start_date <= :RouteDepDate)
      and time_table.routes_id = :id_route

select T1.MO,T1.TU,T1.WE,T1.TH,T1.FR,T1.SA,T1.SU
 from time_table T1
 where time_table.routes_id = :id_route
      And T1.start_date <= :RouteDepDate
      And T1.start_date =
      (select max(start_date) from time_table t2
       where t2.routes_id =  T1.routes_id)

      select cast(max(start_date) as DATE)
         from time_table
          where time_table.routes_id = :id_routes
            and time_table.start_date <= :RouteDepDate
      into :tmpdate;
      select MO,TU,WE,TH,FR,SA,SU from time_table where
      time_table.start_date = :tmpdate
      and time_table.routes_id = :id_routes
      into
      :MO,:TU,:WE,:TH,:FR,:SA,:SU ;