The Roles Permission column you added pushes everything to the left. I had to unchecked it in screen options to fix my problem.
Update: Depending on my window size. I can see the Title . For example the Author column overlaps the title column. if I am at 1024×768 if I resize my window to a smaller size or I maximize my screen to 1280 or higher I can see it. This is very odd for your plugin to do this.
