I doubt that there was a system reset. I would have been affected as well.
It's quite possible that you just miss typed something while setting up the old one. It can happen. Also if someone knew the password from yesterday, the could have reseted it without permission.
I am 100% sure I didn't miss type it. It constantly told me my password was wrong. And as I said, I used the exact same password yesterday without any problems.
The password was created directly after the second time the forum was back and running.