Add-on contents disappearing

I've downloaded some add-ons , Minecraft 15 birthday party, bathbomb, tnt pack, furnitures. When finished game, saved it as always. In this morning when I've turned on xbox, the party supplies became normal blocks, the add on's seems like active in the menu, they are still there, but I can't find the tnts or bath bombs or party supplies or furnitures in the game. When I try to activate it once more, it says: quit from the word to activate it. I did it but nothing happens.