Interesting, I've seen another site a few weeks ago that seemed odd when scrolling too. I think they are a great company with a decent product, but this is a turnoff. I was thinking of contacting them but felt a waste of time since probably whoever I contact would go to someone that isn't a web developer and just feel like it'd go nowhere to improve their site. Especially if it only happens on Mac, and they are using another OS as was wondering if the site did it on other platforms or even browsers too.