Hello, money of unknown origin can't be used. It is recommended to check the specific source of funds at the bank counter with my valid ID card. Never ask others for money other than yourself. You can go to the bank app or the outlet to check the information of the sender of this money and see if it is a unit, company or individual you know.

This may be caused by the following reasons:

1. Incorrect transfer by others: When others use online banking to transfer money, they may fill in the wrong bank card number, resulting in an error in transfer.

2. Red envelopes issued by merchants: At present, after some e-commerce or software apps bind bank cards to participate in certain activities, the event organizers will send the previously promised red envelopes to users in the form of transfer.

3. Transfer test: During a transfer test, the bank card may inexplicably receive 1 cent.

4. Abnormal banking system: If the banking system is abnormal, the balance in the card may not be displayed correctly.

I hope I can help you.