Loading and unloading widget on wordpress site - possible css error? - html

I am developing a science wordpress website and I am having an issue with a widget. When I load the page the widget quickly loads and then disappears.
This only happens in Chrome and Firefox, and not Explorer for some reason.
It is EXTREMELY strange as this widget was working perfectly for a while, and after changing nothing it stopped. I have disabled all plugins and it still does not work. I even restored my website from a backup when it was for sure working -- still nothing.
A page of the website with the issue (just dummy content) is located here:
http://scientized.com/physics-astronomy/
As one can see it quickly loads the image slider:
Then unloads the image slider:
Any ideas?
EDIT: it appears the problem is intermittent. Please refresh a few times to replicate it if you don't see the error on the first load.

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When I refresh the page again after I see this weird page my website loads normally. I want to understand why this is happening and how can I fix this? Here is the screenshot because my website does load sometimes normally.

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I am publishing some simple webpages (HTML, CSS, some JS) from my GitHub repository. When I display index.html in Chrome (55.0.2883.95, 64 bit) by clicking on the URL linked in this repository, the webpage is displayed, but as soon as I scroll down, the featured image disappears when it shouldn't.
The other working link is "Fees" at the top. Click on that, scroll up and down the page, and the featured image will similarly disappear.
I want to point out that I first published this repository/page in Nov. 2016 and the images all displayed fine. Recently I changed the domain name associated with the repo but normally wouldn't expect this to create issues. Also, when I simply zip and download the repo and open in Chrome locally, everything displays perfectly.
Lastly, this site works with CSS Grid so I have the appropriate flag enabled in Chrome. It's hard for me to understand why images suddenly don't display correctly using GitHub Pages!
EDIT Sorry if this question seems vague. Let me restate. Everything seems to initially load and display correctly in my browser. The issue seems to be triggered by merely scrolling down the page.
This code used to display correctly on GitHub Pages. I come back two months later and the same code doesn't work anymore. Image pathnames are all correct. It's evidently not a JS issue. Download the same code and it displays perfectly on localhost.
After reading this thread I realized that one of my extensions was causing the page to disappear on scrolling. Specifically, I disabled the Window Resizer extension and the problem was solved.

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Go here on Firefox 35.0.1 and try reloading the front-page (or any other page for that matter) with Ctrl-F5 a few times...
http://www.cygnusmusic.net
If you don't manage to create a broken page by refreshing it, I'd be keen to know about that too.
On re-loading firefox misses out images and styles in an inconsistent manner, or just displays a 'connection was reset' message over and over again until eventually it decides to part-load the page again. While Firefox is displaying a 'Connection was reset' message, other browsers still have no problem loading and re-loading the same pages.
If this is ultimately resolved as a server issue outside of answers to this question, then I will post any info I have regarding the solution as an answer here.
UPDATE
Here is a link to a video of this occurring on every page of the site, plus a broadband speedtest showing 60Mb+ download speeds...
http://youtu.be/EncGAZs9KAY
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I can't replicate this in firefox, and i have checked the Net tab on firebug to look for slow loading resources, but everything looks fine.
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To confirm that everything is OK, put an alert("loaded") in your $(document).ready();. If it alerts you, the page was successfully loaded and it's just IE being a buggy little... bugger.
Edit: I missed a bit. Continued:
This is ofcourse only the case if you do not have ajax calls etc on the page that can start a loading sequence after the document has loaded. In that case, use the debugger to check for open connections.