The social security issued by the Postal Savings Bank was paid on my behalf, but it was not my account.

Does the subject want to ask, "Why did the social security issued by my Postal Savings Bank pay, but it was not my account?" ? Bank account error, social security agency designated account.

1. Bank account error: the bank or postal bank mistakenly deposited social security funds into the wrong account.

2. Designated account of social security agency: Social security agency requires social security funds to be distributed to designated account, not personal account.