Extra Feathers For Player 2

When killing zombies extra feathers can sometimes be seen on player 2's screen which are not visible for player 1. Neither player can collect these feathers. Deleting the block below makes them drop down so they are not a graphical glitch as they have physics. There is space in both inventories to collect. It seems that player 2 is creating additonal feathers as those visible on both screens are collectable. Other mob drops are not affected. Both devices are identical Samsung Galaxy Ace Plus with Android 2.3.6. Occurs on both wifi and wifi direct connections.