I ran into this issue and, at least for me, it was being a vampire. If you have the CBBE Morphs tab but no sliders, try to start a new game. If the sliders are there, then this is probably your problem. I tried to get Better Vampires to see if it would fix the issue, but it didn't. So you can either stick with what you got, or remove vampirism via console and make your changes then put it back on.