Any suggestions why they are like this? Maybe a la...

The only major problem I can see is that you have been watering the equivalent of 250 cc of water per day, regardless of age and so the media has a lot of water in it, specially now that you have defoliated, because with less foliage, the plant will consume a lot less water. Also, why are you feeding coco nutes when you are using soil? and for a 20 liter pot, you are feeding too early, unless you are using very light soil. Are you measuring EC / PPM? you might be over feeding too

Hi, Looks to me like your plant is flipping over to flower. Defoliating her too much will cause a lot of stress so best to do it little by little and only if you have to. If you’re giving it 0.25l of water that couldn’t be the problem although your medium looks fairly wet. Let her dry out and get real dry before you next water to rule out over watering. I’m certain she’s flipping to flower so the transition takes a little while. Lay of the nutrients for the remainder of the week to rule out nutrient lockout too. Give her a day or two and see how you go. They look stunted but can and will recover. Hope this helps

Hi there! Something bad happened between day 21 and day 28... Your soil looks very wet, how often do you water them and how often do you let the soil dry? These traumas could come from over-watering, but also from hardcore bending, which will require huge amount of energy for the plant to recover. To resume, I'd say it's a mix between high RH, a too high temperature, over-watered pots, and probably over-stressed plants by HST. I'll be around, good luck with these babies, you have some nice genetics in here!