hmm, i agree. looks like it's a dns/proxy issue. if you're using dns or proxy, testmy won't recognize that you belong to "smartbro.net" category
i believe what that graph means, is that in the category 241.176, all the users that tested there average a speed of 670Kbps, while in the "smartbro.net" category, all the users average a speed of 260Kbps.
therefore,if you're score is 322Kbps, you're speed is only 48% of the average if you're under 241.176.
but if you're under smartbro.net, you're speed is 123% of the average.