The other day, I gave myself a few command blocks to put in chests to use for a project. I meant to give myself more to put in the other things I have built, but what happens when I do that is they don't show up in inventory but the game says I have gotten it.

Ex. /give AnnieKirwyn8246 minecraft:command_block 1

It says it has been given, but I don't have it. I also tried restarting the server (several times) and emptying my inventory. I'm not sure if it's happening in my account only or if it's an overall glitch with my version of Minecraft (1.7.5).