The program cannot do compareTo function after the object's update information

I am trying to change the position of the product in the print menu after updating some information of the product. Specifically, arrange "Quantity" in descending order. If the products have same quantity, the list will be sorted with the ascending "UnitPrice" field.

Initially, if i add one more product, compareTo() function works fine, but after i use product update function, the compareTo() function doesn't work. I use TreeSet for this project. Can anyone explain this case to me? Thank you very much.

This is my compareTo() function

    @Override
public int compareTo(Product o) {
    if (this.getQuantity() < o.getQuantity()) {
        return 1;
    }
    if (this.getQuantity() == o.getQuantity()) {
        return this.unitPrice-o.unitPrice;
    }
    return -1;
}

This is my update function

    public void updateInfo() {
    Scanner sc = new Scanner(System.in);
    String id, productName, quantity, unitPrice, numberForAvail;
    while (true) {
        try {
            System.out.print("Input products's id: ");
            id = sc.nextLine().toUpperCase();
            if (id.isEmpty()) {
                this.id = this.id;
            } else {
                if (!id.matches(letter_regEx) || id.length() < 5) {
                    throw new Exception();
                }
                this.id = id;
            }
            break;
        } catch (Exception e) {
            System.out.println("ID must be character and lenght > 5");
        }
    }

    while (true) {
        try {
            System.out.print("Input prodct's name: ");
            productName = sc.nextLine().toUpperCase();
            if (productName.isEmpty()) {
                this.productName = this.productName;
            } else {
                if (!productName.matches(letter_regEx)) {
                    throw new Exception();
                }
                this.productName = productName;
            }
            break;
        } catch (Exception e) {
            System.out.println("Invalid name");
        }
    }
    while (true) {
        try {
            System.out.print("Input Unit Price: ");
            unitPrice = sc.nextLine();
            if (unitPrice.isEmpty()) {
                this.unitPrice = this.unitPrice;
            } else {
                if (!unitPrice.matches("^([1-9][0-9]{0,3}|10000)$")) {
                    throw new Exception();
                }
                this.unitPrice = Integer.parseInt(unitPrice);
            }
            break;
        } catch (Exception e) {
            System.out.println("Unit price must be > 0 and < 10000");
        }
    }
    while (true) {
        try {
            System.out.print("Input quantity: ");
            quantity = sc.nextLine();
            if (quantity.isEmpty()) {
                this.quantity = this.quantity;
            } else {
                if (!quantity.matches("^([1-9][0-9]{0,2}|1000)$")) {
                    throw new Exception();
                }
                this.quantity = Integer.parseInt(quantity);
            }
            break;
        } catch (Exception e) {
            System.out.println("Quantity must be > 0 and < 1000");
        }
    }

    while (true) {
        try {
            System.out.print("Input status [0(not available)/ 1 (available)]: ");
            numberForAvail = sc.nextLine();
            if (numberForAvail.isEmpty()) {
                this.numberForAvail = this.numberForAvail;
            } else {
                if (!numberForAvail.matches("^[01]$")) {
                    throw new Exception();
                }
                this.numberForAvail = Integer.parseInt(numberForAvail);
                break;
            }
        } catch (Exception e) {
            System.out.println("Status must 0 for NOT AVAILABLE and 1 for AVAILABLE");
        }
    }
    if (this.numberForAvail == 0) {
        status = "Not available";
    } else {
        status = "Available";
    }

}

This is my output

When I add in a product:

When I changed NGUYEN's quantity to 125, it didn't work