online, weapons disappear when i mod my classes

when in game online, i have all my weapons and classes and i experience no problems when i initially start the game, it's if i try to alter or even switch my classes i experience dificulties. when i switch or alter my classes, my character becomes invisible and my primary weapon reads that it has no ammo, when i switch to my secondary or equipment, my invintory dispears entirely. despite this the campign and test range work perfectly. I'm not quite sure what the cause of this is, but if it can be fixed or if i could get any advice, i would appreciate it. right now it it just kinda seems like i wasted 110 dollars on this game.