This is normal. Protein in your body is increasing now, so you will gain weight to a certain extent in a short time. Don't be too anxious. The increase of protein helps your metabolism, so you will lose fat later. Since you have bought a private tutor, you should trust the coach and do it according to his method. It's okay to lose 8 kg a month, but one thing is that it's still a little difficult for you to achieve this effect in the first month.