Hi Martin,

I have researched about this issue and it seems to be a WooCommerce issue that it does not show products from the same category only, I found some plugins such as Related Products for WooCommerce or some code which shows items only from a specific category where the product is, but for that I would need your login credentials.

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Hi Martin,

I was trying to login to your site but the credentials wasn't working. However can you please try this code snippet which will narrow the related products query to only the same sub category:

/**
* Only show products in the same sub categories in the related products area
*
* @param $terms - Terms currently being passed through
* @param $product_id - Product ID of related products request
* @return $terms/$subcategories - Terms to be included in related products query
*/
function blz_filter_related_products_subcats_only($terms, $product_id) {
    // Check to see if this product has only one category ticked
    $prodterms = get_the_terms($product_id, 'product_cat');
    if (count($prodterms) === 1) {
        return $terms;
    }
    
    // Loop through the product categories and remove parent categories
    $subcategories = array();
    foreach ($prodterms as $k => $prodterm) {
        if ($prodterm->parent === 0) {
            unset($prodterms[$k]);
        } else {
            $subcategories[] = $prodterm->term_id;
        }
    }
    return $subcategories;
}
add_filter( 'woocommerce_get_related_product_cat_terms', 'blz_filter_related_products_subcats_only', 20, 2 );

The above code should be added in functions.php file of the theme (preferably on child theme).