Labels in doughnat chart

[Andrew_X]

Hi!
I need to create duble doughnut chart with labels inside inner circle that describes every section (point). It looks like http://my.jetscreenshot.com/4765/20120820-8szx-16kb But somewhy labels sometimes shown in wrong position (see screenshots http://my.jetscreenshot.com/4765/20120820-baji-17kb and http://my.jetscreenshot.com/4765/20120820-pu44-17kb). Here is my code for labels positioning:

new PieDataLabels()

.setDistance(-25)
.setPadding(0)
.setConnectorPadding(0)
.setAlign(Align.CENTER)
.setBorderRadius(0)
.setBorderWidth(0)
.setConnectorWidth(0)
.setX(0)
.setY(0)
.setFormatter(new DataLabelsFormatter() {
    @Override
    public String format(DataLabelsData dataLabelsData) {
        return dataLabelsData.getPointName();
    }
})

I'm using Highcharts JS v2.2.1 and Moxie Highcharts v1.4.0.
What can be the reason of this problem and how to fix it?

[Andrew_X]

I tried to do the same with JS highcharts and it worked fine. So, it seems that there is a bug in GWT highcharts wrapper.