"In Queen's We Are the Champions, the lyric at the end of the song "of the world" is missing"
Indeed it is missing, but it is a part of the song its just a bit earlier before the final chorus. How silly that people think this means anything. People remember it because its in fact in this song.
Exactly, that's why people believed it! The lyrics are embedded in their brains, so when they listen to it, it seems like it should be there.