How to reset amended state taxes back to zero after making mistake?

I amended my taxes to add some investment capital gains from a 1099 DIV and 1099 B that I forgot. Then when I got to state I think I clicked the wrong thing and messed up, so I decided to start over and remove the 1099 DIV and 1099 B. The federal number reset to zero, but the state number did not. It's stuck at $665. I think this is a mistake. How do I remove it? How do I reset it back to where it was? How do I find where this $665 is coming from?