@miemie, i think this is not quite what you need. I attach a screenshot of the basket.
1 – there should be a base price of the item (40,900), but additional items are added to this price.
2 – prices of additional goods. Everything is correctly displayed here.
3 – total amount (base price + prices of additional goods). Here, too, everything is considered correct.
https://ibb.co/D9BVBMW