They're using kinetic/smooth scrolling, which is included in theme they're using from Okler. If you look in the JS, you'll see:

  Plugin Name: 	smoothScroll for jQuery.
  Written by: 	Okler Themes - (http://www.okler.net)

And here's a forum where a customer asks to disable it:

http://www.okler.net/forums/topic/disable-scrolling-effect/

Another offender:

https://www.astralgameservers.com/

Inertial/kinetic scrolling is incredibly frustrating when implemented in JS. On my Mac, sure, if I swipe my fingers and let go, I expect the OS to emulate a free-spinning scroll wheel. But when it's emulated in JS, there's no way for the code to know whether I lifted my fingers, so it defaults to making the page skid around uncontrollably, when I intend to quickly swipe - while keeping my fingers down at the end - to go to a precise offset in the page.

It's visually a cute a effect, but I have no idea how anyone thinks that it makes for anything other than an utterly infuriating user experience.

There's something non-standard going on with it for me. It snaps to certain sections at the bottom and I can't swipe to navigate back and forth like I usually do.

exizt88 is correct. I can't swipe to go back a page. And if I swipe up, the page seems to want to continue scrolling at the same speed, it feels different and not fluent.

I am using Windows 8, chrome, Microsoft mouse with scrollwheel.

The scrolling is absolutely broken, it is jumping around all over the place, and made the page impossible to read.