Total amount is not changed after making contribution of 5 dollar

Steps

1. Open; http://novica.com/
2. Add product to cart and continue to checkout
3. In the payment page, make contributions of 5 dollar
4. Observe total amount
5. Make contributions of 2 dollars and see that the total amount is updated

Actual result

After making contributions of 5 dollar, it is noticed that the total amount is not changed but when make contributions of 2 dollar, the total amount is updated accordingly

Expected result

After making contributions of 5 dollar, the total amount is updated successfully