David Abed: Yea I understand the location part, that makes sense to me. But why the engines.
Michael Martinez: Each search engine builds its own index and uses its own ranking and filtering algorithms. <-- I could have sworn, when I wrote this, that the question was about different search engines. Oh well.
Matthew Drake Shockey: As long as you are using the same search engine, it should rank the same on different browsers
David Abed: I am getting three completely different rankings on three different browsers.
Ash Nallawalla: Use incognito mode on all browsers. Sometimes you reach different data centres for the same engine and they are not fully synced.