you're also missing the "accounts" pane...
at some point, i had no accounts pane and an extra login items in the other row...
i don't know what would "properly" fix it... but i had an unrelated problem with my battery, and i pressed the CUDA (i think that's what it's called) to reset the battery and it ended up fixing my prefs problem
i wouldn't recommend doing this unless someone with more hardware knowledge comes along and says it's cool...
also, what panes are in your prefpanes folders? are there 4 keyboards? is classic, accounts, etc there in the folder itself? if so, then that's the same thing that happened to me basically....