broken in menu

the plugin work BUT a very bad trip : inside the menu, a lot of invisible buttons for who they arent logged. If you are logged, we dont see the buttons (with no link and no name (empty but button here), and if you are disconnected, you see a lot of botton in menu… could you fix this please? i’m not alone 😉

http://ww.wp.xz.cn/plugins/wordpress-access-control/