Opal chunks Sliding on terrain

When you go to a Opal Quest item location and pick up an opal chunk, then set it down the opal chunk will slide away from you in a random direction. It does not happen a short distance away from teh location, but it seems to happen consistently on all opel chunk spots.

You place opal chunk down and it slides away from you, either infront or to the side

It does slide away from me