My legend text display 0 to 9, how is that possible?

The legend texts are based on the answer texts. If your answers do not contain any text, the legend text is automatically set from 0 to 9.

If you use Basic 4.x you do not have to fill in the answers. Simply indicate that you want your audience to make a choice of 1 to …. The software will now automatically create a diagram with these answer options.