I started using nutes when they were 29 days old and i saw some of the lower leaves turning yellow. The pot might be to small, its only 5l.You appear not to be taking into account that your medium has "start fertilizer works immediately and provides an optimal nutrient supply for up to 6 weeks." You are only at day 33 (4.7 weeks), yet have been feeding your funky fertilizer. Any nute use has apparently not been needed yet.
Besides your fertilizer not having right N-P-K proportions, it's probably just that, only contains cheapest N, P and K sources, simple salts, not chelated salts with optimal bioavailabiity. And your fertilizer likely has zero trace elements and other needed and good stuff, that are normal in even the cheapest cannabis-oriented base nutes.
--- sorry to say mate, but this one is fragg'ed,.. the soil, the imbalanced nutes, the burn, I'm betting the pH is off too,.. it's all one shitstorm of interacting issues, and it lead to this weird reaction,... no fix will work in time, so just ride her out if you want to, or scrap it and start over,... get quality milder type soil, and proper NPK balanced nute's,...