Are you certain that's not from passive HP regeneration? I don't know how that stats screen works so Ihav eno idea if regeneration counts.
If this is true and havent been noticed till now, it just shows how worthless spell vamp is.
© 2014 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.