I'm using BarChart and I've a very strange problem. First time I display data they are displayed correclty in the chart, but next times the reference axes moves.

Thi is a test case to reproduce the problem:

FXML:
    <?xml version="1.0" encoding="UTF-8"?>
      
    <?import java.lang.*?>
    <?import javafx.scene.chart.*?>
    <?import javafx.scene.layout.*?>
    <?import javafx.scene.layout.AnchorPane?>
      
    <AnchorPane xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.chart.Chart">
       <children>
          <BarChart fx:id="chart">
            <xAxis>
              <CategoryAxis side="BOTTOM" />
            </xAxis>
            <yAxis>
              <NumberAxis side="LEFT" />
            </yAxis>
          </BarChart>
       </children>
    </AnchorPane>



Chart.java
    package application.chart;
      
    import java.net.URL;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.ResourceBundle;
      
    import javafx.application.Application;
    import javafx.application.Platform;
    import javafx.beans.property.ObjectProperty;
    import javafx.beans.property.SimpleObjectProperty;
    import javafx.collections.FXCollections;
    import javafx.collections.ObservableList;
    import javafx.concurrent.Task;
    import javafx.fxml.FXML;
    import javafx.fxml.FXMLLoader;
    import javafx.fxml.Initializable;
    import javafx.scene.Parent;
    import javafx.scene.Scene;
    import javafx.scene.chart.BarChart;
    import javafx.scene.chart.XYChart;
    import javafx.scene.chart.XYChart.Data;
    import javafx.scene.chart.XYChart.Series;
    import javafx.stage.Stage;
      
    public class Chart extends Application implements Initializable {
      
        @FXML
        private BarChart<String, Integer> chart;
      
        private ObjectProperty<ObservableList<Series<String, Integer>>> seriesProperty = new SimpleObjectProperty<ObservableList<Series<String, Integer>>>();
      
        public static void main(String[] args) {
            Application.launch(Chart.class, args);
      
        }
      
        @Override
        public void start(Stage primaryStage) throws Exception {
            primaryStage.setTitle("Hello World!");
            Parent root = FXMLLoader.load(getClass().getResource("Chart.fxml"));
            primaryStage.setScene(new Scene(root, 700, 500));
            primaryStage.show();
        }
      
        @Override
        public void initialize(URL location, ResourceBundle resources) {
            chart.dataProperty().bind(seriesProperty);
            loadRemoteData();
        }
      
        private void loadRemoteData() {
            Task<Void> task = new Task<Void>() {
                @Override
                protected Void call() throws Exception {
                    System.out.println("Attesa....");
                    Thread.sleep(1500);
                    Series<String, Integer> serie = new Series<String, Integer>();
                    List<Data<String, Integer>> valori = new ArrayList<>();
                    Data<String, Integer> data1 = null, data2 = null, data3 = null;
      
                    data1 = new XYChart.Data<String, Integer>("Column1", 1);
                    data2 = new XYChart.Data<String, Integer>("Column2", 5);
                    data3 = new XYChart.Data<String, Integer>("Column3", 0);
      
                    valori.add(data1);
                    valori.add(data2);
                    valori.add(data3);
                    serie.setData(FXCollections.observableArrayList(valori));
      
                    final List<Series<String, Integer>> lista = new ArrayList<Series<String, Integer>>();
                    lista.add(serie);
      
                    // Aggiorno la proprietà su cui il grafico esegue il binding
                    Platform.runLater(() -> seriesProperty.set(FXCollections.observableArrayList(lista)));
                    
                    
                    System.out.println("Attesa....");
                    Thread.sleep(1500);
                    serie = new Series<String, Integer>();
                    valori = new ArrayList<>();
      
                    data1 = new XYChart.Data<String, Integer>("Column1", 0);
                    data2 = new XYChart.Data<String, Integer>("Column2", 0);
                    data3 = new XYChart.Data<String, Integer>("Column3", 0);
      
                    valori.add(data1);
                    valori.add(data2);
                    valori.add(data3);
                    serie.setData(FXCollections.observableArrayList(valori));
      
                    lista.clear();
                    lista.add(serie);
      
                    // Aggiorno la proprietà su cui il grafico esegue il binding
                    Platform.runLater(() -> seriesProperty.set(FXCollections.observableArrayList(lista)));
                    
                    
                    System.out.println("Attesa....");
                    Thread.sleep(1500);
                    serie = new Series<String, Integer>();
                    valori = new ArrayList<>();
      
                    data1 = new XYChart.Data<String, Integer>("Column1", 1);
                    data2 = new XYChart.Data<String, Integer>("Column2", 1);
                    data3 = new XYChart.Data<String, Integer>("Column3", 1);
      
                    valori.add(data1);
                    valori.add(data2);
                    valori.add(data3);
                    serie.setData(FXCollections.observableArrayList(valori));
      
                    lista.clear();
                    lista.add(serie);
      
                    // Aggiorno la proprietà su cui il grafico esegue il binding
                    Platform.runLater(() -> seriesProperty.set(FXCollections.observableArrayList(lista)));
                    return null;
                }
            };
            new Thread(task).start();
        }
    }


When you run the example youll see 3 refresh of the chat: first time are displayed values 1,5,0, then 0,0,0 and then should be displayed 1,1,1 but as you can see in the image you'll see 0.9,0.9,0.9.

http://snag.gy/XG0A6.jpg

Is this a bug?

Thanks