Hi,
Be default, WooCommerce only display sale price on cart, checkout. If you want to change it, edit file like this:
On line 87 of “woocommerce/cart/cart.php”, you will see this code:
echo apply_filters( ‘woocommerce_cart_item_price’, WC()->cart->get_product_price( $_product ), $cart_item, $cart_item_key );
To show price with old price, replace it with this code:
echo $_product->get_price_html();
Best regards