UPDATE: It is now back to normal! Pic posted in comments. Thanks everyone for trying to figure this out.
Has it always been a black bar like this? I don't remember my theme wallpaper looking like that. I honestly don't like it like this lol.
I see what you mean, I only have that black bar on the bottom when I'm in a app but my home screen is full. I am going to keep looking, also have you see what VerbumVeritum asked ?