Submenus not appearing

There is fully functional menu on a top of a website. I want to nest that menu between a logo and a shopping cart. The problem is when I nest it there something is obstructing the submenus to show and I spent the whole day figuring whats the cause but with no success.

When I put it above ‘<div class=”col-lg-12 col-md-12 col-sm-12 yt-megamenu”>’ submenus appear but when I nest it in that div it appears only when I put “row” class and delete yt-megamenu class from that div.

Interesting things is that submenu shows during the page load but disappear after is loaded. I’m guessing the problem solver is putting the z-index or overflow css rule on specific element but I don’t know where.

The website is http://www.trendtastique.rs/

Thank you in advance