[PeterisP]

The amount is unusually large for this type of mistake, making it newsworthy, but it isn't particularly unique. I have personally seen a couple cases of various mistakes in banking (both on customer and bank's side) causing accidental repayment of debt that otherwise would be unrecoverable as the payer became insolvent. Mistakes happen. Human processes and technical processes can help make a bit less mistakes, UX is part of that.