I've lost my .header-title:after & nav folder item styling, please help!

Site URL: https://www.jackogradyphoto.com/

Hi there!

While adding some css today, I've somehow managed to break my previously implemented css that made the nav folder items (under work) change to black on hover, and I've also lost the 'action sports & lifestyle photographer' caption under the header title. 

Weirdly, it still works and looks as it should but only on 1 page - the 'snow' page under work. See pictures attached for what I mean, the first shows how it should look and and second is what it looks like now.

I have no idea how I broke it, maybe I deleted previous css by mistake. But it doesn't explain why it still works on 1 page? Any help would be hugely appreciated!

Add to Design > Custom CSS

/* Folder black on hover */
.header-nav-folder-content>div:hover {
    background-color: black;
}
.header-nav-folder-content>div:hover a {
    color: white;
}

Big thanks for the response Tuanphan, I managed to fix it 🙂