Drill down tag showing wrongly

Hi

in the example https://jsfiddle.net/bt53pywe/1/ you can see this happening just follow the steps:

1 Do the selection on step1.jpeg

2 Expand accessories like step2.jpeg

3 In the console execute "pivot.getReport().slice"

Appears correctly: "drills: {     rows: [{   tuple: ["tree1.[accessories]"]"  (step3.jpeg)

4 Change the selection for the lowest level in tree1 step4.jpeg

5 In the console one more time : pivot.getReport().slice

Wrongly continues appearing: "drills: {     rows: [{   tuple: ["tree1.[accessories]"]" (step5.jpeg)

We are quesstion this because when has the drill tag where is not needed flexmonster do requests that are not necessary decreasing performance.

Thanks

Eduardo