MobGriefing Item Bug (With Video)

When you put MobGriefing in true, when you click on Q a selected item will get placed in the players foot (like boots). When you put MobGriefing in false, the game will run normally.

VIDEO:

It shows the bug if you don' t understandme(sorry :S)

http://www.youtube.com/watch?v=sP1HGc389Pk