I know it's easy to project one's own experiences but it might be a manufacturing issue with the pickup - if one magnet has been put in the wrong way round, you'd get that. Happened to me with a Cort Space, which has split magnets and I can only assume that one magnet was put in the wrong way round - the consequence was that with the blend set to both pickups equal, the B, E, and A strings were very thin and nasal, the D and G sounded fine.