edit: Found somewhere online to double-check what I was doing. Found the problem. The forms aren't set up well. All is well now. :)
edit 2: Okay, I'm officially glad that the NC tax forms are dumb, because I found somewhere to file online for free for both my federal and state taxes (http://www.statetaxfreedom.com/, if you make under a certain amount of money) and I got a credit I didn't know I could get, which means I get more money. Woot. :)