submenu in a mobile version is not closing on click

[shigapov]

I have menu with a few items and subitems. The menu is sticky. When I open menu in a mobile version and click on one of the items, I cannot close (on click) that submenu anymore. If one of submenus is opened, then scrolling in menu is not working anymore. In my case one of submenus has many items. Because I cannot close submenu and scrolling isn't working, I cannot see the whole submenu and the items on the bottom of menu. Any ideas?