Var is a very mild weak androgenic compound, needs to be stacked with some test to really be effective. Your question as to why you have gained weight is simple, you started "eating" - Carbs, and probably more calories, if you were on a carb depleted diet, probably starving yourself bitch diet, and cardio every day, your muscles lack nutrients, amino acids, and water. They were depleated and flat, nothing really to them.
So what happened to you??? DO YOU KNOW WHY body builders carbo load before a show, because it blows up the muscle cells. Makes you look full. This is exactly what happened to you. You never gained any muscle, your current cells are just filling back up with water and nutrients.
Granted, unless your scale was wrong and not balanced, then nothing would have changed with you.