I /think/ it's something to do with a save-for-web colour shift. I actually see a different colour image to both of the ones you've screenshotted! There must be a colour profile on the image that is reacting weirdly with your browser/computer settings - although I have no idea why it would be different on the same browser but two different web addresses. I'm not fully understanding of /why/ it all works that way, but I do suspect colour profiles as being the issue. I'll mention it to my art team!