<
>With OP I suspect this is exactly what happened. He had his Secret Question active and he used it to recover his password and that triggered to lock his account. <
>
That seems to be it. Looking over the
Seclog there is an entry for the OPs alt locked account that states:
Today at 08:42:30 AM - sehoon - password reset via secret question
If you want to remove the secret password feature once you restore your account you need to delete the content of both the question and answer (see
[Solved]:Removing Secret Question already with an answer).