Yeah, why is every image, heading, and paragraph on that page surrounded by scrollbars where most don't work and are not necessary?
This incidentally led to the bug that they're blogging about too.
This is what I see in Chrome on OSX.
body.blog .blog-post p { overflow: scroll; }
We had a similar bug reported at work recently, and it turned out that Windows browsers will always show scrollbars but the ones running on OS X/iOS will hide them until you start scrolling.
To turn them on in OS X, go to System Preferences > General and set Show scroll bars to "Always".