 Some souvenirs disappear after each previous generation, which is not a glitch but a feature.Souvenirs 2 (Town Hall Key), 3 (Key #2), 7 (Clean up game medal), and Souvenirs 18 to 21 (Arcade items players can win for free) disappear when the new generation appears.These are free items users can turn back on if they saved the passwords that turned them on in the first place.