mega menu not works propery in my site

I see page: https://forum.tagdiv.com/mega-menu/

I’m having some issues configuring the megamenu after importing the “animals” demo.

In the demo, the megamenu looks fine. The subcategories are properly organized, and on mouse hover, the posts update accordingly (see image below).
https://tinyurl.com/2craxygq
However, on my site, the subcategories appear one below the other, and the mouse hover functionality doesn’t work (see image below).
https://tinyurl.com/28x3pd92
Since I didn’t build this site myself, I want to make sure there’s no incorrect code, but I couldn’t find anything in **Appearance > Customize > Additional CSS** or in the theme’s CSS files.

How can I fix this?

tnx