Stycky menu and JS what's the conflict?

Question

JavaScript

On the site being developed, the style with the visible: hidden rule is taken from somewhere; and the menu output is not displayed. So in order:

• We open the site geotopokad.com, scroll down and see the correct operation of the menu, it sticks to the top and stays there,
  
• Go to the "Services" submenu and the menu works correctly
  
• We return to the landing part of the site, any item of the main menu, and we get where we planned, but without a menu,
  

to access the menu you need to go up and you can go down if necessary and it will start working correctly again.
The problem was found in the second line of the "header" section

<div class="navbar-main wow fadeIn stiky" data-wow-delay=".3s" data-wow-duration="500ms" style="visibility: hidden; animation-duration: 500ms; animation-delay: 0.3s; animation-name: none;">

but what script causes to determine, alas, there is not enough knowledge, the search for JS scripts did not lead to a result.