get_category only returning details for ‘uncategorized’

Clearly this is because the ID you are passing to get_category is wrong (false or 0).
i don’t know how you configured the taxonomy add on but do a vaR_dump and double check what data the get_field function is returning, maybe it’s an array with a single value in it :

get_category(array_pop(get_field('category_test')));

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