JavaFX 2.0 :: BarChart Wrong Data Displayed

I'm using BarChart and I've a very strange problem. Is not very simple create a test case to understand where is the problem.

In the first image is displayed a bar with the value of 2 but as you can see the y axis is not correct.

In the second image the value displayed is 4 but the y axis is completely busted.

Important thing: In my real app I change data of the chart every time the user change a combobox value (the period).
 
First image
Second image
 
This is a test case that simulate what I'm doing in my app with the only difference that data are fetched remotely with an async request in my real app.
 
Chart.java

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>>>();

[Code] .....

Unfortunately with this simple test case the chart display correctly data.