Ah I see, the module cart handles that somewhere else from the main cart.
You need to edit the file components/com_hikashop/views/product/view.html.php and change the code:
foreach($rows as $k => $row){
$currencyClass->quantityPrices($rows[$k]->prices,@$row->cart_product_quantity,$main_currency);
}
to:
$product_quantities = array();
foreach($rows as $row){
if(empty($product_quantities[$row->cart_product_id])){
$product_quantities[$row->cart_product_id] = (int)@$row->cart_product_quantity;
}else{
$product_quantities[$row->cart_product_id]+=(int)@$row->cart_product_quantity;
}
}
foreach($rows as $k => $row){
$currencyClass->quantityPrices($rows[$k]->prices,$product_quantities[$row->cart_product_id],$main_currency);
}
I couldn't do it with your FTP access since yu only gave me access to the back end files of hikashop.