Dropdown, colour change issues

Hey guys

Looking for a bit of help with a site I’m working on here.

I have a drop down menu, with titles pulled from a collection and within each dropdown are links pull from another collection. Associated with each link is an image and a background colour. This is all working quite well and I’m pretty happy with it. However, I’ve noticed when I activate a dropdown and hover over a link, the the dropdown above it disappears, but not the ones below. I’ve tried everything and can’t work out what this is.

Any help would be amazing!

Thanks in advance

Here is my public share link: LINK
(how to access public share link)