Sivir Spell Shield on Jhins W, led to indefinite marker on her.
Watch youngcopes's League of Legends video: Sivir root bug - Plays.tv
My friend is talking during this, sorry for his negativity...
anyway, i noticed after sivir spell shielded one of my roots and walked into the FOW that afterwards she had the rooting symbol beside her for the rest of the game.
The clip attached just demonstrates that she hadn't taken any damage from my team for a while yet she had the rooting symbol on her.