Nidalee Spear Went Through Heimerdinger Big Turrets

On top near the bush, Nidalee threw her spear. I put down heimer's big turret attempting to block the spear. I was standing one space away from the turret. The spear went through turret and hit me. Another time is at mid, I put down a small turret, the spear went through the edge of the small turret and hit me.