The British artist M.I.A is being confused with a German artist of the same name (mia on Last.fm) by the Last.fm Scrobbler when played through Spotify.
When I went to mia - Paper Planes, there was a yellow banner across the top with the correct artist name and the option to 'Flag This', which I did. You can do this too.
Problems scrobbling M.I.A. from Spotify.