The GUI compared with 0.15.0 and 0.16.0 is completely different. The interface on 0.16.0 seems more unstable because the interface seems smaller and more narrow, the items seems just as big as the slots, maybe a little bigger, and whenever you transfer items, the green bar doesn't hover over the item. If your finger moves away slightly from the item, the green bar does as well and the transferring stops. This bug has been here since droppers, hoppers, and dispensers were added.