If you account for the fact that you did 5 comparisons instead of 1, you may find that the anomalous results suddenly become statistically insignificant, ala http://xkcd.com/882/. (It's possible your spreadsheet accounted for that, didn't check). If you're interested in these kind of things, check out HydrogenAudio and the Listening Tests forum there, they run these kind of public blind listening tests regularly and the result you got certainly isn't a surprise. (There's also some tools like ABC/HR that make running them much easier.)