I think the pigeon drop happens as sometimes people ghost appear in your casino and you can ask someone to get a pigeon for you and then drop it on the person ghosting in your casino. I know as have done this (sorry! pls don't kill me) it has happened to me a few times too and usually it has been when I was idle in my casino so maybe when we are idle for long enough we are making ghost appearances elsewhere lol I don't know but hopefully that helps James out to what is going on and can maybe fix it.