Hello Vaitulis, maybe u can try to lower your day and night time temprature in your garden. At this state of flower its to hot for your plants and its probably slowing the growth of your buds an also letting go the weakest leaves. If u can try to lower your day time temp to 22.7 degrees celcius and nighttime around 16 degrees celcius. Your buds will also get much more denser. And i think the yellowing of the leaves will also stop. Right now its not that bad, especially if you act quick. Hope the answer was helpfull. Keep on growing, Peace 👍🏾