[PS 1.7] Cart is not refresh or showed twice
If shopping cart do not work corectly in your shop then make sure ps_shoppingcart module is installed, enabled and inside module configuration ajax cart is enabled
If above not solve or If your shopping cart is visible twice on header, then do not disable ps_shoppingcart but instead go to design > positions and unhoook ps_shoppingcart from displayTop or/and displayNav2 hook