Arras: Sub-sub category menu problem

Hello everyone,

I am using the arras theme and my own menu (created from the theme menu editor). I have made enough changes in the css code of the theme and now i face a problem.
I want to create a sub-sub (!) category and when it is created it doesn’n appear properly in the menu. You can see what i mean by visiting https://www.dailyone.gr and viewing the subcategories 1,2 of the main category GoGreen. You can easily fing it in the right of the main menu.

The “1” category (under GoGreen) is hidden when the “2” category (under the “1”) appears.

Waiting for someone to help me!