Sql query with case condition?

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SQL-Server-2014

select  * from vOrderDetails D where OrderID = 65
select * from tblOrderReturns R where OrderID = 65

First Table Data

OrderDetailsID OrderID productname

19 65 abc
21 65 ddf
20 65 asdf


Second Table Data


OrderDetailsID OrderID

19 65
21 65


Here I write this query

select O.OrderID,D.OrderDetailID,D.ProductName,
case when R.OrderDetailID  != D.OrderDetailID then '0'
else '1'
end ReturnItem
From dbo.vOrderDetails D left outer Join tblOrders O On O.OrderID = D.OrderID
left outer join  tblCustomerLogins L On O.CustomerID = L.CustomerID
left outer join tblOrderReturns R on R.OrderID = D.OrderID
Where O.OrderID = 65 And L.SessionID ='8004837C7D62qdSV8'

Now i want to display Three colomn but i get
6 rows
How can i do this?