Thread: Rreason behind the varying Google rankings?

What could be the reason behind the varying Google rankings?

I have been doing my clients ranking reports but I have been observing different rankings for the website on different computers and because of the caffeine updates it might have happened is what I believe. Has anyone else also been observing these problems? Normally a combination of ranktracker, SEOMoz and manual checking is what I use in order to ensure that the ranking analysis is accurate. However, I am unaware of what results should I report back to the client with all these issues. Does anyone have any advice for me?