Health problems?

Many things going on here. Well yes you could have been overfeeding, your other plants are already showing brown tips indicating that. Your EC(PPM) is like 0.8-1.3 thats not that high for flowering, even for autos( i did even 2.3 lol with lots of only watering) but still you should check up on your soil, Try to flush and see what is happening in your medium(soil) but that is not the only issue here in my opinion. You had most definitely a heat and light problem as well, look at the leafs. and when you found out, i can only gues you lifted your lights? What will happen? the buds will stretch, you get thoose fox tail looking buds from both things ;) Look at week 10, picture 4, plant behind this one, that plant is already foxtailing because of that decision. Sure foxtailing can be genetics but i don't think so with your plants. What happend with this plant cannot be undone but you still can harvest her when she is ready, but just don't make decisions for this plant that can screw up others. You also should give your plants a time to rest. Sure 24hours a day can be done but you should do like 18-20 hours a day, your plant will love it more. As for your lights, there is not a perfect height from lamps to plants with leds but since you use like 150watts, 60-70cm might be to high. Just make sure you don't run 24hours a day, have 27degrees temperature, then you can lower your lamps for better compact buds. You can try to make your filter run faster, inflate fresh colder air, make your fans blow better on your cantopy. Goodluck growing :) Goodluck growing.