Your humidity is the culprit. High humidity causes damage to leaf stomata and root zone because transpiration cannot function normally so the plant is not processing nutes, sugars, and water correctly. You need to get that under control and especially before flowering! It can cause horrible issues with bud development. It will also make your plant way more susceptible to pathogens both above and below soil (nut just mold).
Humidity is often over looked especially in veg stage. Don't fuckin do that be on top of your environment in every stage. The other plants are probably more tolerant in veg to it due to genes and that one is not.
Edit: forgot to tell you sweet spot but 45% is what I always aim for 55+ and you risk things in my experience.
Also for those of you watching the one knothead repeatedly kill his seedlings by putting a fuckin plastic bag over them in probably too hot of a room that is what is killing his shit, but he is too smart and experienced to listen to others and continue learning. I learn stuff all the time from others. Never ignore people you should have thicker skin than that.
Also pure FFOF will run out of nutes on a lot plants around day 35, but don't mistake the natural leaf cycle of lower leaves dying as flowering progresses. This is very natural in many gene pools as long as it is from BOTTOM UP. Top down is always a nute problem. Bottom up can be too little N and some macro nutes. 10 years ago FFOF taught me this lesson. Good master growers helped me fix it on the mag, but also keep my cool. Very thankful for them.
