Feed does not catch Sale_Price nor Products Variations

website: https://www.assaggiassisi.com/negozio/
exmaple product issue: https://www.assaggiassisi.com/prodotto/assaggiarosso-vini-rossi-umbria/

Variations of the product based on the number of items. Users can buy 2 bottles, 3 bottles. Directly from the same page just by clicking the preferred option.

We are using Woocommerce for the website and this plug-in for the product feed. I made sure to insert a different SKU for every variation; however, when I generate the feed it only catches the product including the 2 bottles

SKUs:
VIN-ROS-2
VIN-ROS-3

Feed link: https://www.assaggiassisi.com/wp-content/uploads/wppfm-feeds/woo_aa.xml

I can’t figure out why.

In addition. a few products are on offer at the moment with a discount. I have inserted the logic for the sale_price, but again it does not seem to be catching it.

Let me know if you need more info.

Thanks,

Simone