What's wrong with my plants? (More in comment)

Now I have noticed that the leaf tips (not all, only those at the end of the leaf) are brighter. At the first plant the main stem starts to turn purple. The dying of the leaves progresses upwards. I don't know what to do anymore, what could be the deficit? This is my first grow. I look at the deficit tables and nothing is clear to me.

So I shouldn't worry, nothing bad is happening?

Привет, друг! 👋 Жаль что нет полного дневника, я бы дал совет более точно! 👆 Но постараюсь помочь тебе! У тебя слишком слабая освещенность в месте культивации растения. Нижний этаж практически не освещен и закрыт тенью растения, поэтому там видны бледные листья и почки. Растение чувствуя что это не вырастет, пытается переместить элементы и воду в точки, более потенциальные для роста. Освещенность - сыграла основную роль происходящего! 👆 Растение вытянутое, междоузлия длинные, это типично для недостатка света! 👆 Я бы не переживал, если вы уже в цветении! Попробуйте получить урожай тем методом, которым вы идёте, но лишний солнечный свет, хотя бы непрямой, ей бы сейчас не помешал! 👌 Удачи, брат! ✊😇

Previously I suspected phosphorus and nitrogen deficiency (yellowing and dying lower leaves and red branches at the leaves). The plants then received 120% of the dose of fertilizer and it seemed that the problem had disappeared. The branches did not turn red anymore and the leaves stopped dying. It was four waterings ago. The next watering was water, then water+fertiliser 100% of the dose and yesterday only water. In the second plant, dying of the leaves doesn't progress, but the first plant makes me nervous. It seems to me that the damaged lower leaves are a few more than it was, but maybe it's just an impression and these are the leaves that the plant has started sucking up before and sucking them up to the end. At the bottom of the plant some branches and leaves are very bright. They are small, looking like young leaves, the big ones are of a normal colour. Yesterday when I was just watering, I checked the ph of the water that leaked out from the pot. It reached about 8. I measure them every time I water, both with and without fertilisers. It has never been so high, usually the maximum was 7 when I was giving the fertilizer. I know it could have been flushed out by that earlier watering. I don't know if I should be worried about that, and could that be the reason for how my plant looks? And one more thing. My plants are taller than the manufacturer stated on the site when I bought my seeds. The 1st is 20 cm more and the 2nd is 26 cm more. The sizes given by the manufacturer: 1st: up to 80 cm (indoor), up to 90 cm (outdoor) - currently it has 100 cm 2nd: up to 50 cm (indoor), up to 60 cm (outdoor) - currently 76 cm. *Potted Soil: BioBizz Light-Mix *Fertilizer: BioBizz Bio-Grow, BioBizz Bio-Bloom, BioBizz Top-Max *Flowerpots: 9L (1st) and 7L (2nd) *Lighting: COB LED Citizen CLU048, color 3500k, 100W (currently set to 60-70W) *Temperature: 22-23 degrees. *Humidity: 40-60% *Water pH: 6