Oibed, I would need a little more information on what you did. Here are a set of questions of you don't mind.
* Are you still using the lobby editor?
* Did you close (exit) the program so it's not running?
* Did you restart your game?
And if it doesn't work after this the only things I can think of is reset your stats or trying to find another method of re-doing what you did. ( You can find some posts on the "Call of Duty Ghosts hacks" on setting your level and other things).
Hope this helped!