Seems there is a bug with the quest "Frozen Eyeballs" in Kingdom of Elements, not sure if it is just me but i took screenshots as it would be easier to represent.
Note: Burning the quest and retaking it does not work, this has been an ongoing problem for several days now.
Quest part 1 : Kill 10 of these mob and collect the drops
Quest part 2 : Kill 10 of these mobs and freeze them with previously picked up drops
That all works great... until you freeze the mob, the item dissapears and Quest part 2 dissapears and shows you have only picked up 9 in part 1