Concatenation when using horizontal bars

I have a problem, when using horizontal bars with category and sub category it shows me the category first, but when selecting one of the categories shown in the bar to see the subcategories, the subcategories are shown but also concatenating the categories.

For example I have the category "computer" and one of its subcategories is "laptop", when selecting the category "computer" shows the subcategory laptop but instead of showing only "laptop" is shown so "laptop computer" bone are concatenated. Is there a way to avoid it?

1. You have the following table with categories, each one has subcategories

2. When clicking on one of the categories, the subcategories associated with the selected category are displayed, however the names are concatenated with the category to which it belongs and what I would like is that only the name of the subcategory is displayed.