12kg in just 7 weeks. how much of that was actual muscle tissue? a fraction of that.
so of course you will lose most of it. if you don't want to lose weight after cycle then don't put on bullshit weight. water weight is fluff anyway and not healthy.
imagine 12kg every 7 weeks. so after 10 7 week cycles you would put on 120kg. does this sound realistic or logical? of course not