Dropdown menu show up without hovering over

Hi,

I am struggling with an issue that When I enable this plugin my dropdown menus display when my mouse pointer enters the dropdown area even if it is currently hidden. This is in particularly because of “visibility: visible” css added to submenus. Issue is if I override it, keyboard navigation stopped working. So, basically, it does not solve the keyboard navigation of menus.

It would be much appreciated if you can help.

Thanks
Moh