My first grow. 3 autoflowers from fastbuds. Starting to get problems...?

Growmi420 1. 13.04.2025 - №1 planted 14.04.2025 - №2 & №3 planted. +- 12 hours diff. Env: AllMix BioBizz substrate.
- LED light 20% level intensity and 60 cm to the ground.
 | Average RH: 45-50%. Temp: ±25 C 2. Light watering for 2 days until appearance of sprouts up to 16.04.2025. 
 | Average RH: 45-50%. Temp: ±25 C 3. 16.04.2025 - watering with Solution#1 (1.1-1.2L Filtered water + 2ml Root juice + 1ml Bio Haven + 2ml Acti-Vera + 3 drops BIO down to stabilize PH to 6.2 from 7.0). 
Lower LED lamp -5cm to ±55cm above the leaves. 
 | Average RH: 45-50%. Temp: ±25 C 4. 17.04.2025 - watering with Solution#1 (±150ml cup/plant). No PH measurement :(
Raised LED +20cm to achieve 75cm above leafs and 18-20k Lux. 
| Average RH: 50-55%. Temp: ±25 C 5. 17.04.2025 at 22:40 switched to 20-4 light cycle - rest from 20 to 24. | Average Night RH: 60%. Temp: ±22 C
Lowered LED to 40cm above canopy to achieve DLI ±13 6. 18.04.2025 - watering with Solution#1 (±200ml cup/plant). Daily PH adjusted to 6.3 from 7.2 
| Average RH: 50-55%. Temp: ±25 C 7. 19.04.2025 - watering with Solution#2 (1L Filtered water + 3ml root juice + 1 ml bio-haven + 1 ml acti-vera + few drops BIO down for PH 6.1) (±150ml cup/plant). 
 | Average RH: 45%. Temp: ±26 C 8. 20.04.2025 - watering with Solution#2. PH 6.1. (150ml/plant + 50ml bigger circle around) 
| Average RH: 50%. Temp: ±26 C 9. 21.04.2025 - watering with Solution#3 ( 2L filtered water + 6ml root juice + 2ml activera + 2ml bio-haven). PH 6.1. (150ml/plant + 50ml bigger circle around) 
 | Average RH: 50%. Temp: ±25 C 10. 22.04.2025 - watering with Solution#3. PH 6.2. (150ml/plant + 50ml bigger circle around) 
 Switched to 23-1 light cycle to achieve DLI ±16
 | Average RH: 50%. Temp: ±25 C 11. 23.04.2025 - watering with Solution#3. PH 6.2. (150ml/plant + 50ml bigger circle around) 
 | Average RH: 50%. Temp: ±25 C 12. 24.04.2025 - watering with Solution#4 ( 2L filtered water + 8ml root juice + 4ml activera + 4ml bio-haven). PH 6.3 (150ml/plant + 50ml bigger circle around) 
 | Average RH: 55-60%. Temp: ±26 C 13. 25.04.2025 - watering with Solution#4. PH 6.2 (150ml/plant + 50ml bigger circle around) 
| Average RH: 55-60%. Temp: ±26 C 14. 26.04.2025 - watering with Solution#4. PH 6.3 (150ml/plant + 50ml bigger circle around) 
 Start LST (tie down) №3 - bcs have 3 pairs of “true leaves”.
 | Average RH: 55-60%. Temp: ±25 C 15. 27.04.2025 - watering with Solution#5 ( 2L filtered water + 8ml root juice + 4ml activera + 4ml bio-haven + 0.5ml fish mix). PH 6.3 (300ml/plant circle around leafs) 
 Start LST (tie down) №1 - bcs have 3 pairs of “true leaves”. 
 Update LST №3 - extend along stem
 | Average RH: 45-50%. Temp: ±26 C 16. 28.04.2025 - watering with Solution#5. PH 6.3 (350ml/plant) 
 Start LST (tie down) №2. 
 Update LST №1. 
 Switched to 18-6 light cycle and LED light 40% intensity to achieve DLI ±24
 | Average RH: 45-50%. Temp: ±28 C 17. 29.04.2025 - watering with Solution#6 ( 2L filtered water + 8ml root juice + 4ml activera + 4ml bio-haven + 1ml fish mix). PH 6.3 (300ml/plant circle around leafs)
 Update LST №2 - extend along stem
 Update LST №3 - extend along stem
 | Average RH: 50-55%. Temp: ±29 C 18. 30.04.2025 - watering with Solution#6. PH 6.4 (300ml/plant circle around leafs + 0.5l for the dry soil around)
 | Average RH: 50-55%. Temp: ±29 C