I just got an email from AirBnB about fund transfer failure due to "insufficient account details in my current payment method" and to add a new payment method that works. When I checked the existing apyment method, to my surprise, I found that the account number (only the last 4 digits are shown) is not what I previously had in the system (and funds have been successfully transferred through). I removed that and addedd a new method. However, I am keen to know how this bizarre change could happen (is it fraud, hacking or what?)