Flickering div navigating through pages

Help
1

i have a jekyll site on github pages https://myartportfolio.github.io/paper/paper-2

ON CHROME: clicking through the links on the navigation results in the the navigation disappearing while the page loads. (firefox:no issue, localhost: no issue)
ive tried reordering the css load order but cannot figure out what is causing this?

Any help would be greatly appreciated!!
Thanks!

2

looks good to me, did you do anything to it?

might just be a cache thing. If the html pages are not cached at all then when the page loads it does a refresh and you may see it like you describe. GH may have some cache things it does to help with that.