What is happening to my plants?

Burning from feeding too much or too often, or maybe both........ The super green leaves are an indication of nitrogen toxicity. In soil it is a schedule of plain water/plain water/feed/plain water/plain water/feed........so that the plants are being fed every 10-14 days, which is plenty. If these are auto plants, half strength nutrients are usually strong enough. Remember too, it is very easy to fix a slight under feeding, but very, very hard to rescue a burned over fed plant. Heat is not the issue, unless you let them dry out and never feed if the temps are going to be over 35. Where I live we get 2-5 days in a row multiple times each summer of 40+ and temps as high as 47 at times and my plants don't get burned or suffer when kept correctly hydrated. Have been doing so/experiencing this for 35+ years too.

@Chow_13. Yes, but the weather is hot and I am growing outdoors. This week will be over 40. So under direct sunlight it will be 50 or more. The ABC is photoperiodic. The normal leaves plants are automatic; Pinky Sixty strain. I feed them water. The substract has 50% potting soil and 50% clay balls and perlite bone meal and dry avocado tree leaves. So, they should have enough nutrients. Yes I have had normal growths. Just never grew them in the terrace. Maybe they are getting burned idk... So I moved them to a more shady place. In the terrace they had blasting direct sunlight most of the day. Light hours are as long as the day lasts; about 15hours.

Hard to say with no info. What are you feeding, how often. Did you ever have normal growth. How old is the plant. Photo or auto. How many hours of day light do you get. Heat is high. 25 is ideal, anything over 30 is to hot.

I'm not sure on the others. Looks like your NPK is outta wack. The 40c outdoors shouldn't be an issue I don't see any heat issues. + once you have some sort of breeze that doesn't translate to the leaf temp! So, heat issues I can't see. Although your plant is outta wack. I c P def in pics 2&3. The others I'm not sure about.