Exceso de nitrógeno? Raíces pidiendo transplante? Cuál es mi problema?

I'm with Organoman on this one... transplant them now, give them only pH'd water for a week and then, when you reintroduce nutes, only give them 1/2 strength to start out... You've gotten to this situation because your plants are strong and growing robustly! Incredible grow, really! Good luck!

Hi! You can notice how the dark green color and the leaves curling down indicate an excess of nitrogen :) they're also curling down because the pot is now small, the roots are struggling to grow due to lack of space and oxygen, so change the pot right away and put them in one that's at least 12L, with which you can take them all the way to the end of flowering :) temperature and humidity are right✌️ Happy growing

Yes, they need transplanting and soon! Yes, they are over fed with nitrogen. However, some plants/strains do grow like this naturally with folded down leaves, especially some indica dominant hybrids.