Board Thread:Support Requests - Getting Technical/@comment-35289850-20200830155719/@comment-9605025-20200830183831

Actually, I think these are because of the combination of a user rename and the change Fandom made to the naming system. They switched from using the usernames to the userids and so they ran a script across the entire farm to change them accordingly. However, it would appear that they didn't account for the actual content. Here is what I am guessing happened.
 * 1) UserA posts on UserB's wall creating PageA.
 * 2) UserB renames to UserC moving PageA to PageB and leaving a redirect at PageA.
 * 3) Fandom makes its change to the naming system and runs a script to change the names of the pages without leaving redirects. This means PageA gets renamed to PageC and PageB gets renamed to PageD. However, the script doesn't update the redirect so PageC is still pointing to PageB which no longer exists.