Yellowing leaves and twisted new grow !!!!!!day 15 from switch

Hbk

New Member
Hello everyone, This is my first grow..outdoors indica variant. They are in day 15 of flowering (fliiped). In last 3 days my leaves are turning yellow at an increasing speed and making its way to top. Medium is soil with perlite mix and compost all of which are organic. I am from kathmandu(Nepal) the land of the himalayas. Though, environment is one of the idealist to grow and i keep watering them every 3-4 days. What is wrong with these.Please provide guidance
 

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