[Theme: Evolve] Error in menu

Hi everyone!

I have Evolve theme, and it worked just fine, but suddenly I noticed that sometimes there is a dropdown box in menu!
The first line is “<span class=”glyphicon glyphicon-align-justify”></span>”.
It seems that it shows up when I first open the site. After reloading it again it disappears.

I didn’t make any serious changes in the theme – only fonts, and sizes of the sidebars…

I looked here and saw that some people had it also, but couldn’t find the solution.

I am really not that much into programming.
Any help will be appreciated.

Svetlana