To class="cart_quantity_number", więc wygląda to na błąd w skrypcie.
W pliku shopping-cart-product-line.tpl
znajdź:
<span class=“cart_quantity_number”> {if $quantityDisplayed == 0 AND isset($customizedDatas.$productId.$productAttributeId)}{$customizedDatas.$productId.$productAttributeId|@count}{else}{$product.quantity-$quantityDisplayed}{/if} </span>
i zamień na:
<span class=“cart_quantity_number”> {if $quantityDisplayed == 0 AND isset($customizedDatas.$productId.$productAttributeId)}{$customizedDatas.$productId.$productAttributeId|@count}{else}{$product.cart_quantity-$quantityDisplayed}{/if} </span>