Drops falling out of the tower in Orbis

Description of the bug: (optional screenshot/video): Gold meso coin drops out of tower (See SS)
What is supposed to happen?: The drop is supposed to fall inside the tower, and the pet is not able to pick the drop up. (The gold meso coin to my right... Gave me the chills when I think about a monster card/rose dropping outside the tower.)
Where did you find and/or notice this bug?: Orbis Tower Floor 3
A step-by-step guide to re-producing this bug (optional): Hunt monsters at Orbis Tower. Some drops will fly out of the tower.
Extra information (optional): Happened in upper floors while hunting fire sentinel too, so I assume this occurs throughout the whole of Orbis Tower?