that seems like too much mass to put on in that short amount of time. My bet is most of it would be fat. It is said that the average person cannot sustain more than .5lb of muscle growth per week, and that is if diet is strong and clean, and your workout if more than half decent. So in 6 months I would say the average person could expect to gain around 10-12lbs of muscle. You have gained 35lbs. Now lets say that you have gained around 8-10lbs of muscle, since I am estimating that your diet and workout are not at 100%, that means you have gained 25 additional pounds, comprised of mostly fat, and glycogen storage.
Although you have experienced gains in your lifts, I personally (from what I have learned from this forum) would reduce your calorie intake tremendously. Are you tracking your calories? What is your BMR?
If so, and you dont feel you want to reduce, then I would suggest doing some cardio (HIIT) to reduce fat gains on your bulk. If you keep at what your doing, you will build muscle, but you will also have to cut a lot of fat.