If your credit limit is 19,000, it means that the maximum amount that can be overdrafted is 19,000, but the actual available limit does not match. There are usually several reasons.

1. You have multiple CCB credit cards. Since the limit is exclusive, the use of other cards will also affect the limit of this one.

2. If you have applied for installment, the installment limit will occupy the credit limit. The credit limit will be gradually released only after each installment is recorded and you repay.

3. You have consumption that has not been recorded yet. Because as long as you consume, the available credit will decrease, but the balance will not change until the consumption is recorded.