AoE spells bugged.

When im casting AoE spell, namely Dizzying Haze (i don't know if its bugged for others), spell green targeting circle doesn't disappear after casting it, it remains until you manually cancel it with escape or right click button.
It is astronomically annoying and game disturbing. Does anybody knows a fix, or is it simply server bug? I literally don't remember this annoyance being in retail wow.

someone on wowhead Dizzying Haze page mentions this so i suppose this one is working as intended