Problems with donut chart

Hi

I am trying to make a simple donut chart, where one elements is highlighted like this:

Image may be NSFW.
Clik here to view.

Now it you notice, there is an anoying /0 in the end of the name / the highlighted element - why?

I cannot see how I should be able to change this, the settings looks like this:

Image may be NSFW.
Clik here to view.

Is there a bug in version 1.29?

/Thomas