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).
Edit:
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
Edit2:
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.