sticky navigation stops working (menu disappears) half way down page

Any chance you can disable all plugins except GP Premium for us to have a look?

Thanks :)

All disabled - 'cept GB Premium.

Thanks for taking a look

David

Do you have any custom functions/CSS on the site that you can temporarily deactivate/remove to test for conflicts?

Specifically, can you remove this CSS?:

#primary {
    height: 100vh;
    width: 100vw;
    /* background-color: white; */
    margin-top: -40px;
    margin-left: -55px;
    padding-left: 50px;
}

Hi Tom, I've removed GP Additional CSS.
What's the next step? Should I activate plugins and check or are you still working on it?
Thanks
David

I checked the page Scientific Studies and looks like it's fixed so the CSS Tom indicated is causing the issue.

You can go ahead and activate the plugins now.

Thanks all for your time and patience in sorting this out, great help.

David

Glad we could help :)