Serpbook is constantly showing my keywords in different positions than when I check Google manually. For example right now it's showing a keyword as number 1 but when I look at Google it's number 8. If I click the magnifying glass to see Google through their eyes, it shows it as number 1. I try this at multiple locations like my house, work, friends house, and it's always the same position (but different from theirs) What's the reasoning behind this? Can results show up different for different people?