Just tried it on FireFox and all fine. Try resetting those browsers and try again.
HOWEVER at the office we have this new laptop with that AMD E1 CPU and it does what you noted. Not a web site issue at all on that laptop!
I have been a long-time reader of this site. One of the recent re-designs has introduced some behaviors that degrade my viewing experience.
1) Vertical scrolling is slow and jerky. I have tried IE11 and Chrome and both are slow stop-and-go when trying to quickly scroll down the page. It seems like there is some responsive resizing or dynamic content loading that is too intensive. I would much prefer a static view rending with options to change layouts or "load more" content, etc.
2) Going into "detail" on an article is still allowing different articles to infinitely scroll below it. This does not match my viewing style at all. Perhaps this is useful to others. I open the main site, when I want to view an article, I ctrl-click it to open in a new tab. I go to the new tab and read the article, then scroll down to read comments. With the new design, when I scroll down to read comments, its easy to miss the comments area since they don't load by default, then the next article just shows up. Is there any way to turn this off? I find it very disruptive to see the next article when I am viewing a particular article. I much prefer to go back to the main page list (still in my first tab), and continuing scrolling the list of articles, etc.
These are my opinions and otherwise I really enjoy the site. If there are ways to configure the site to satisfy my issues above, I would like to hear about it.