When in creative mode, the first item added to an empty space on your quick inventory will duplicate. When you drop the item, all will drop. This only happens to the first item. This issue was said to be resolved in build 6. Hopefully by build 8 this will really be resolved.
Notice two compass in the image attached.

Testing on a ROOTED Kyocera HydroLife Android 4.3 Device as well as a Verizon QTAQZ3 Tablet running Android 5.1.1