Why did two of my leaves do this

I haven’t grown anything for a very long time, are used to use cocoa and follow a strict nutrient regiment now I’m in living soil, build a soil three. Oh with auto flowering plants just as a test run before I go in clone my mother and go for a run with some photos. I was watering them the other day and noticed that the tips of two of my fan leaves on one of my plants had wilted. They were just slumped over and looked lifeless. Only the tips only on one of the plants. Temps are good the leaves aren’t even the ones closest to the light not sure why it did this, does anyone have an explanation.