Who knows exactly why this happens? Well, IT. And maybe you Comp Sci majors.

Anyways, always have more than one browser option available to use, just in case one browser won't load or display a page properly. It takes just a few moments to try loading the webpage in that alternate browser(s), and it might display in one when it wouldn't in the other. (No 100% guarantee, though.)

Another possible issue can be caused by old 'cookies'. (You know  those little tracking programs that so many websites tell you they want to install on your device and use to make it quicker for you to log in later, and you have to approve them putting them on your computer?) Sometimes a webpage won't load correctly due to 'old cookies'. In which case, it can help to completely clear out your cache / the cookies. Yes; I know that can be annoying (you have to re-login to everything), but doing that sometimes fixes browser page-loading problems. And isn't that all that matters in the end?