Observable list insertion order changes every time i run this code. how to solve this?

I want to compare two lists but this tableview only accepts observable list this list always changes its insertion order which is difficult for comparison. how to keep the list in its insertion order??!

thanks in advance

public class MapCompare extends Application {
    TableView<ECOitem> ecotable;
    @Override
    public void start(Stage arg0) throws Exception {
        VBox v=new VBox();
        ecotable = new TableView<>();

        TableColumn<ECOitem, String> changeColoumn = new TableColumn<>("Change");
        changeColoumn.setMinWidth(200);
        changeColoumn.setCellValueFactory(new PropertyValueFactory<>("change"));

        TableColumn<ECOitem, String> changeAnalystColoumn = new TableColumn<>("Change Analyst");
        changeAnalystColoumn.setMinWidth(200);
        changeAnalystColoumn.setCellValueFactory(new PropertyValueFactory<>("changeAnalyst"));

        TableColumn<ECOitem, String> cycleTimeColoumn = new TableColumn<>("Cycle Time");
        cycleTimeColoumn.setMinWidth(200);
        cycleTimeColoumn.setCellValueFactory(new PropertyValueFactory<>("cycleTime"));

        ecotable.setItems(getProduct());

    }

    private ObservableList<ECOitem> getProduct() {

        Map<ECOitem, String> data = new HashMap<ECOitem, String>();
        data.put(new ECOitem("ECO1001223", "sharon", "68:20:32:31"), "1");
        data.put(new ECOitem("ECO1001266", "anna", "52:21:59:53"), "2");
        data.put(new ECOitem("ECO1001258", "sharon.bosman", "48:0:47:33"), "3");
        data.put(new ECOitem("ECO1001255", "shar", "48:0:46:15"), "4");
        data.put(new ECOitem("ECO1001256", "bosman", "48:0:43:39"), "5");
        data.put(new ECOitem("ECO1001257", "shaman", "42:19:11:32"), "6");

        ObservableList<ECOitem> products = FXCollections.observableArrayList();

        for (Map.Entry<ECOitem, String> value : data.entrySet()) {
            products.add(value.getKey());
        }
        System.out.println(products);

System.out.println(products);
        return products;
    }

    public static void main(String[] args) {
        launch(args);
    }

}