Confused

So lately, Ive been playing on servers. After playing in a couple of servers, I went to one of my worlds. Then I noticed that certain things were missing from the inventory. The world is creative. The things missing were dispensers, droppers, pistons, sticky pistons, ender pearls, eyes of ender, and a few other things. I dont if the missing items have anything to do with the servers, but please help! Fix it!

Jacob Middleton about Minecraft: Pocket Edition, v1.1.5