A: This is a problem we’ve struggled with over the years, and have worked hard with our manufacturing partners to minimize it. Sometimes there seems to be almost a sort of static-cling effect that holds one piece inside the other, particularly when the pieces are totally new. We do find that this effect diminishes with time, so we’d suggest just continuing to play with the pieces you have. We can’t really guarantee that any replacements we sent wouldn’t occasionally do this too…