Curate, connect, and discover
Robin was probably the first ghost at button house ever. There probably wasn’t anyone there before him that’s been sucked off. When every other ghost died they had someone to explain things to them, to comfort them. Robin didn’t get that, it probably took a while for him to figure out what was going on. All he knew was that he got struck by lightning and now no one can see him and he can walk through stuff. He might not have had any concept of what a ghost was. He was alone and confused for centuries.