Heimer floating Turret

when i was playing a time ago we were winning. The Nexus only had one turret left minnions every where you get the picture. A big team fight i had a turret placed i got knocked up used an well it did its thing. Next thing i saw was that my turret was litterly floating like the froze it in that position but, it still worked so it was only floating above us but still shooting and turning no animation's were frozen. Than some champion (don't remember wich) came and killed it with a group damage ability. So yea i don't know why it was or kept floating after that but maybe you guys can fix it*[slayer-pantheon-thumbs]*

P.S if there are any grammer mistakes i'm Dutch so no judge