That's the site (the pfsense blog as opposed to…?), and if you pick around in the javascript for the theme they've purchased,there's all sorts of scrolling f***ery going on there. I'm sure it varies from browser to browser, OS to OS. I'm Chrome, OS-X. It's site-specific. I've seen similar behavior on a handful of other sites, usually WordPress blogs with one of those themes that has a 200+ item bullet list of features to justify the cost of the theme.
Just pointing it out, if the blog guy doesn't grok the code they have in place that's fine, just noting it's totally annoying and gratuitous. It resides in common/common.min.js.
I also have no interest in disabling "smooth scrolling" to correct one site. I like my smooth scrolling elsewhere, TYVM. :)