Do you foliar feed or spray your plants under the light? cause the water tends to build up at the tips and it could be burning them.
Or it could be the start of minor nute burn. I'm not sure on either, just throwing out thoughts to help brainstorm hahaha.
Also I think I have one of those messed up nugs on one of my plant, its also one of the bigger ones cause it creates more flowering spots so I think your "mistake" might have been a blessing in disguise.
peace out for now, shits looking goooooooood