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Keeping button states after click

Hey, I have setup a FAQ page that uses categories as a sticky nav. I have category buttons sorting content through custom code which is working great but whenever I click away from the buttons (example: anywhere else on the page) the button no longer stay bolded which is needed as my focus state.

I need these buttons to stay bolded. This is especially important on mobile as the category buttons serve as a header for the content. If anyone could help me with this it would be much appreciated!

Here is my site Read-Only: