Data from session is not added but it is recreated while testing with client side

This thing works on server side fine for me, session successfully adds data in a cart as it should. But on client side (I'm using axios) the session is constantly being recreated. By recreating the data I mean for example when I try to add more items in cart, whole the time quantity is still 1 and it is being recreated constantly with last item.

This is file where I use session:

app.use(session({
    secret: "hideSession",
    resave: true,
    saveUninitialized: true,
    cookie: {
        sameSite: true,
        httpOnly: false,
    }
  }));

Whole add_to_cart route request:

app.post("/add_to_cart/:name", async (req, res) => {

    let db = await connect();
    let cursor = await db.collection("products").find({})
    let finalData = await cursor.toArray();
    const name= req.params.name;

    const singleDrink = await finalData.find((product) => product.name === name);
    let cart;
    if (!req.session.cart) req.session.cart = cart = new Cart({});

    else cart = new Cart(req.session.cart);

    req.session.cart = cart;
    cart.addDrink(singleDrink);
    console.log(req.session.cart,req.session.cookie)
    res.send(cart);
});  

client side using axios:

addToCart(name){
        return Service.post(`/add_to_cart/${name}`)
    }

This is expected output in console (property ukupnaKol is quantity). I get that output on my server side:

This is output which I get (no matter how many items I add, property ukupnaKol - quantity will always be 1):

This is the postman request (cookie/session settings also):

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