problem with price in cart window impulse 7.6.1

[lf]

hello, i need to solve a problem with my shopping cart window, if i add more than one quantity of an item it doesn't give me the crossed out price and the discounted price next to it but gives me the single price of the product lowered, this is the url of my site try to check by adding this product to the shopping cart: https://tilma.it/collections/giacche-in-pelle/products/salvador-giacca-in-pelle

I would like the same setting as this site, check here too: https://monova-milano.it/collections/bestsellers-heren-r/products/rocky-giacca

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