Menu categories bug problem

Hello guys,
I have a website on wordpress on witch i have a sidebar menu of 6 categories.

Let’s say:

1.(qwe)
2.(asd)
3.(zxc)
4.(ert)
5.(dfg)
6.(cvb)

Each of these 6 categories in the menu that is located on the left side of the website when pressed takes you to a certain page, but still shows you the other categories on the left side of the “Menu Sidebar”

The number 1 has a problem, when clicked, it takes you to the page but, does not display the other categories (2-3-4-5-6), happens on every browser, sometimes it displays on chrome but not all the time.

If anyone has any ideea of how to fix this, thanks.

The website its done in wordpress.

https://wordpress.org/plugins/menu/