Just trying to find out if this is a string defect, which I'm pretty sure it is. Bought a pack of SIT powerwounds, all the strings are fine except for the e string, which when I put on buzzed like hell especially on fingerings before the 12th fret. On closer examination, the string appears to be two different gauges, getting thicker on about the 12 fret. I'm pretty sure this is what's causing the buzzing and the string to sound horrible, or do I have to adjust the truss rod? All the other strings don't buzz. And if it's a defect, who do I complain to, the retailer or SIT? THanks.