So.. you believe you have lost weight cause you are vegan... Not because you stopped eating junk food? Well, you are so wrong here.
Being vegan does not have anything to do with losing weight. Removing junk food full of shitty carbs and fats does.
Since you also removed high quality sources of protein from your diet (chicken, eggs, milk products ... ) and replaced it with soy, enjoy your man boobs very soon..