What’s going on, so close??

Didn't look like a mutant till flower. Cannabis plants can excrete up to 40% of the carbon they fix through photosynthesis from their roots. This carbon is released in the form of root exudates, which are substances secreted by the roots. These exudates are a significant source of carbon for soil microorganisms in the rhizosphere, the area of soil directly influenced by plant roots. The more carbon fed to microorganisms, the higher the spike in ec. Possible but not sure. What I am sure of is as flower progresses and more carbon is placed into medium the wayer retention can increase, potentially limiting root respiration. Stress itself can come in many forms, temp, light, ec, all sorts, if the plant has too much stress across all the possible stress metrics then it just freaks out. Looks more like a stress response from possibly weak genetical lineage made her go wonky imo, wouldn't be surprised if you find a few seeds in there come harvest. She may be a little developmentally challenged but given she came this far doesn't necessarily mean she won't smoke well. Hope she works put for you there.

Genetic mutant that will never amount to much.............cut your loses and start again.............this plant will be a waste of time and effort........unfortunately.

Shitty genetics... autoflowers seems to have this trait more often than photoperiods.. similar to a dr grinspoon trait. excess spiraling and lanky side branching could be light-related too, but just looks like an autoflower that shit its pants to me.

looks like to much stress as others have said especially this long into flower the damage mat be done. The one is in a very small pot adding more stress. As we know, LED lights don't produce much heat but they will cause serious light burn. I only use a 100 watt LED Spider Farmer light and it has to be at least 15" away from tops to prevent light burn. If it's legal where you are and warm enough, I would take them outside or at least put near a window that gets good natural light.

light is too close,try 60-80cm away from the plant,give them 12/12 for a day to chill out,and then try 18/6 for the rest of the grow.You will be more than fine!!

It looks like she is too close to your light source causing it to foxtail. Very unfortunate. At this point I believe it will be too late for a recovery. Some foxtail smoke are quite good. Just depends on your preferences.

Reduce number of hours with lights on and see if that helps.

24 C shouldn‘t cause heat stress or heat damage, but maybe your Heater ( if it‘s one ) inside your tent coocking the roots of your lady

If it‘s Not genetics I would say heat stress & Not enough Air circulation maybe also Not enough ventilation… if Not damaged roots & so damaged genetics i would say heat stress