leaf deformity

Your over feeding the auto flower, they do not like as strong of a feeding solution as photoperiods. https://www.autoflower.net/forums/threads/med-man-method-feeding-chart-ppm-ec.47856/ This is a great guid for an into to basic auto flower feeding. It will obviously vary between some plants but its a good start to work off of. Best Of Luck! ***disclaimer, multiple people are answering all questions as there is a contest called GOTM, when a user is selected as the answer they get a point. Please see the contest page for information regarding the details: growdiaries.com/giveaways/GotM-August-2022 Please note, when you reply to anything on the questions part of Growdiaries website, no one will be notified of this. Not even if you use a "@" tag in their name. Best to reach out to them in DM using your inbox, it can be found in the bottom right hand corner of the site. It's the small paper airplane button, it will be highlighted green if you have new messages***

Sawasdee P'sway, You give too much nutrients! Start to give only 75% of what you gave before and your plants will be okay! The damaged leaves will not recover but the new growth will be healthy! Happy Growing na krab! 😋

This could be a minor nutrient deficiency, possibly caused by nutrient lockout (to much of 1 nutrient prevents the uptake of another). If this is the case, normal watering and they will recover. Then, back to feeding, maybe a slightly weaker solution until you see how they respond.

I wouldn't worry about it. It's only in one spot, so would make me think it had some trouble while it was forming. Either a bug, drop of nutrients or little mutation. If it was a deficiency, it would be on a few of the leaves, so don't think you need to do anything to fix it.