| Reply : 18 Aug 2011 There are lots of reasons why it could be happening, but it's hard to know for sure. It's important to realise that Google is constantly updating itself and trying to be as relevant and useful as possible, so it will naturally fluctuate.
Google is increasingly trying to personalise the search. So if you bring up a list of results and don't click through to the sites (or click through and the quickly back again) it "thinks" that the result wasn't as relevant as it initially thought it was. So it can adjust the results accordingly. Although this won't normally affect your ranking very much - its not impossible.
Of course, if you have a Google account (e.g. for Adwords or Analytics) and happen to be logged in, Google can list any sites that you have visited previously (and that are relevant) at the top of your search. So that could bias the result and make it look like you are doing better than you actually are. If you are unsure whether you are logged in, check the top right corner of your Google window for your email address. If you have a second browser installed, try searching there instead.
Finally, the Google results can differ based on your location. So, if you search at home you could get a slightly different result to that you get at your office. Although this is unlikely to affect it much unless you work in a different city from where you live.
Google do provide a useful tool for tracking how well your website is doing in their "Webmaster Tools" which can tell you the average positions your site is getting and for which search terms. You might be surprised what people are searching when they find you.
Hope this has helped in some small way, but unfortunately there is no way to know precisely what might be causing it.
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