Board Thread:General Discussion/@comment-47248914-20201028174529/@comment-9605025-20201028174931

Other than having your specific account hacked, there are two likely reasons for this issue.
 * 1) There was recently a hacker attack on Fandom's servers and Fandom had to randomize the passwords on accounts that had potentially been compromised. If this happened to you, then you should have received an email (via the email verified to your account) informing you of the breach and providing instructions on how to reset your password.
 * 2) The Fandom and Gamepedia user databases were merged. If you had the same username as someone on Gamepedia, your account may have had "-fduser" appended to the end of it.