It looks like you're pushing the metal around rather than cutting it, which upset that bur on the end of your journal. That might be due to your tool's lack of sharpness, incorrect grind for the material, or a "built-up edge" on your tool tip; here's what Wikipedia has to say about that: Built up edge - Wikipedia, the free encyclopedia
Brass cuts a little bit differently than steel, so you need to sharpen your tool differently to cut it effectively. The tool generally wants a zero to negative rake for brass; zero means that the edge presented is square (90 degrees) a positive rake is somewhat acute while a negative rake is a little bit obtuse. Here's an article that talks about this in more depth: Basic Lathe Tool Grinding