Sidebar Menu at Brave-Theme

Hello,

I uses the Brave theme and was really happy about it.
I have only one problem when I uses a custom menu (jQuery Vertical Accordion Menu) as a widget in the sidebar. The menu works but there will be shown a ">" (greater than) and an empty line for each menu-item.
See a screenshot here: www.benrenner.de/austausch/brave-menu.jpg

Do you have any Idea or solution for that problem?
Maybe an other working accordion menu?

Thank you very much.
greets,
ben