Collapsible sub menu

Hi, I want to display multilevel categories in my app. And my source external db from where I pull in the categories in to Bubble. This is my first level of category list.
image I have put both parent category and sub category, both in repeating groups.
And when I click one category, it should display the respective sub categories.

But this is what I get… All sub categories are expanding when I click one category even though the subcategories are not displayed. Can anyone help me fix this…

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