What is the problem?

(K) Potassium deficiency and over watering looking symptoms. They usually go together in soil. Wet muddy soil locks up Potassium and/or if you’ve not fed enough K or there might be something else as well blockin the uptake. This case I would think its due the over watering and during the bud set plant needs increased amount of Potassium. Let the soil dry out and give them balanced dose of good bloom ferts. And could add little extra Ca&Mg boost to help absobption and photosynthesis.

Nutrient block bro and I think u might have stunted them

Potassium deficiency and over or under watering. Mixed with nutrition burn and nitrogen toxicity. My question is are you getting good run off when applying water. I think that is the main issue is salt build up in soil causing ph and other issues. Plants grow in size due to substrate. Like coco coir and perlite can grow big plants but takes time to maintain their coco. Hydro soil is next, then living soil and soil. Good luck and happy growing 🌱