This part of the amount shown as negative is the overpaid part, which will be deducted first when the user swipes the card, and can also be used to repay the later bill or take it out.
Should the credit card be paid off immediately if it turns from negative to positive?
No need. If the credit card becomes negative, the cardholder only needs to repay on the repayment date, or he can choose to repay in advance, so that the limit can be restored as soon as possible.
It should be noted that the use of the card has nothing to do with the front and back display. As long as the credit card has an available amount, it can be used for normal consumption.