Hi Andreas,
Since the data is limited to just 3 values (0-2), the intermediate points are plotted as decimals.
This is the default behavior.
However, you can modify the scaling values in y-axis template category in the MII workbench to see only integer values in the Y axis.
Select the "Use Scaling" property and give the min and max range. I have an example as below:
In this case the bars will look smaller as we have data only till 1.
Regards,
Shruthi