your appearance is more muscular because you added muscle, you do not lose fat from the compound, the tren makes you draw out a lot of water which gives the appearance of being 3% less bodyfat.
I have no idea what happens, I dont really question it, it always happens through, my abs start coming through more and my low back starts tightening up.
Adding the muscle allows my body to burn more calories and bring the fat through, which in essence is what icelord is alluding to (i think)
Sort of throws doubt on heavily muscled guys not being able to get super ripped though.