Jquery Vertical Accordian Menu Remains Always Expanded

Hi
When I use TwentyTen theme, this problem does not occur, but when I use Travelify theme, the problem takes place. All the menu items remain open, although I expect them to open only when the user clicks on an item. I have tried all the settings. I changed everything in the settings of this menu, but it still remains open. I even removed all the other widgets, but the plugin refuses to collapse the parent items. This is awful. Like some other friends said, there might be something wrong with the CSS, but what should I change in the CSS? This is a big failing. Please help.

Thank you

https://www.ads-software.com/plugins/jquery-vertical-accordion-menu/