Mega Menu not showing on hovor

I’m trying to recreate the mega menu that came in the theme. However, on the main menu where where I’ve added my categories for product search is not displaying the way i want it to. It’s giving me a drop-down menu instead of a mega menu?

If you look at my attachment examples I’ve kept the ‘accessories’ category for reference while building the site which is a mega menu. However, my ‘Health and Beauty’ section is a drop-down menu? (but they are in the same place, why are they different?)