It is a bug I've been trying to figure out. Sometimes, when you request a song, the song directly after it will still say 'Requested by X' even though I have specific code to clear that field out. Weirdest thing is, sometimes it clears, sometimes it doesn't.
I haven't worked on it too much lately as it is fairly low priority - if you refresh the page manually it will go away.
I'm assuming that was what happened.. as long as the song you DID request played OK :)