Chartjs-Chart.js. Edit bar width -v2.5-

The reason why that space is appearing, is because, you have an empty label in your labels array.

labels: [
   ["aaa", ' ff'],
   ["aa", " ddd"], "ee eeee", ""
                              ^^
],

Remove that empty label (if not necessary) and you will be good to go.

Here is the working code on jsFiddle