Hi Plebone!  Thank you for topping up.  The balance shows in realtime, it is a very simple calculation 12,000sats / 30 days.  I am sorry for the confusion, I should improve the form input so that it doesn't auto-fill when balance is positive number..  You're all set and have a month of balance paid right now.  Thank you for contacting support.  I am crediting you an additional 5k sats toward your next month for using the support portal :)  Feel free to reach out anytime with questions or anything.