Guides are different! Answered
I've just released a new version of the site. The main difference is in how Guides are handled. We've changed them so the Instructables referenced in them are linked directly, where previously the Guide simply contained links in the text. Aside from allowing any updates made, or changes of picture, to be immediately picked up, this change also lets Guides be created more easily. It's also a prerequisite for another feature we're preparing… which I can't tell you about quite yet!