I bought 8 months a SX J-Bass in Italy (I went over there for the summer). I was very happy with because it was working really well. Then school started, and I joined my High School Band. I tried the school's bass, and it weighted half of mine! So I thought maybe it was just the model. But then my teacher came to show me his and same thing! Yesterday I weighted it and it weighted about 13.5lbs..., and in RondoMusic it says it should weight 9lbs! What's going on? How do you think I can solve the problem?