It was the same code, the code was not edited. There was no mistake when I copied and pasted it. I have it backed up in two places, I used the two.
Sounds good with your backup practice.
But when I was about to post this, my browser has logged me out, I used the same captcha-bypass code and it worked this time.
What does "my browser has logged me out"?
Your account can be logged out automatically if someone log it out in another device. If it is your case, it's time to check your email security and change email password, 2FA, your forum account password and its 2FA as well.
Bitcointalk has feature when you logout on one device, all current login session will be logout in any device.