I actually found a small bug in it. When picking DragonBalls and Meteors, there are times that it doesn't pick it up if a monster is standing above it.
For example, when you kill a monster and it drops a Meteor. Then while your character is walking towards the Meteor an monster re-spawn on top of it. The character walks toward the monster and after a second or two it goes away killing monsters randomly again and never picks it up again.
I think the reason for this bug is because when a meteor appears it first confirm the coordinates. Then it clicks on it the meteor once to pick it up but it never tries to confirm whether the meteor is still there or not. So the solution would me click on the meteor, if after two seconds the meteor is still there attack and click on the meteor until the meteor is not on the map anymore.