Er, I mean, they do disappear in the scene? They only show up in a flash and then leave. But also, that sounds like you just need to re-download the game? Sorry, I don't update this game because it doesn't make me any money at all: so the best I can do for you is suggest that you re-download the game. If you're on a newer phone than you were before, that is probably the issue. This game doesn't run well on newer devices and there's really not much I can do about it, sorry.