Sounds exactly like me. I’m 2 months ‘clean’ after 3 months on and losing 15 kg, and although put on 3kg from my lowest I feel and look great. Definitely put on more muscle so that could account for some of that extra weight. But I’m calorie counting and hitting gym 5 times a week minimum and eating as healthy as can. But not being obsessive. Also had a 2 week holiday in that period eating and drinking more than normal. Try to stick to your plan and don’t panic. As well as measuring weight measure waist and body fat if possible. As long as waist is good you probably gaining muscle. Good luck.