I tried with Chrome 27.0.1453.116 m
Did an auto-detect scroll mode, then it came up with "Vertical scrolling" "Scroll by: By single row", and the net result was it couldn't guess the margins and overlap after scroll-capturing the Chrome window.
Went back and changed the "Scroll by:" to "By pages (Default)", and SSC then did a nice capture, and 'guessed' the margins and overlap correctly (using the available buttons for that ofc).
I missed that you tried it on that specific page
Tried it with a totally different page, seems that site is doing something to the scroll and keyboard-handling of Chrome
In Firefox it's even worse
It's absolutely to do with the static background image and the overlayed content that is confusing SSC, No idea how to solve that, other than using a manual capture (tip: set 'Scroll by:' to 'By Pages (Default)') and the number of pages to 4 or 5 depending on screen-size and resolution.