Values changing to 100 % on dimension selection

[Aspiring_Developer]

Hello ALL,

I have created  a mekko chart using vizlib extension in qliksense using below dimension and measure:-

Dim - Brand | Dimension

Measure - Sum({<Category={'Price Range'},NumMonth={"$(=num(addmonths(max((NumMonth)),-12)))"}>} Volume)

Now when I am making selection on brand filter , my values are changing to 100 % like below :-

Below are the  values inside my dimensions :-

I don't want my values to change to 100 %. If I making a selection on specific brand , it should give a particular value :-

For price range - 0to 200 . So , on selection of brand as BT , the value should be 21 % and should not change to 100 %.

Can anyone please help ?

Thanks in advance