I just had a problem moving some plants from under my DIY LED light down to the grow room to put under a 400w MH light. Started spraying for thrips and mites but took them out from under the light to do that. Fed them all with what I though was a medium dose of AN Jungle Juice 3-part I'd just bought while out in BC last month. F'n near fried my 3 latest Cherry Noir clones from a buddy back east and my GG#4. The two Pink Kush and the Earth Lover CBD plant loved it and are doing great. Repotting tonight I hope.
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Different than what is happening with you but those f'ed up top leaves look like damage from the spray and maybe lights on them while still wet?
Anytime I have sick plants I dial things like feed and light back until they show improvement.