Overall looking really nice and healthy. Good work!
I had a similar situation last year, gave all my plants the same amount of water during the same time intervals, then one day two plants were droopy like that. I immediately thought it was over watering since it showed like the day after watering so I decided to let it "dry out", which only made things worse because they were actually being under watered. Gave them a bit extra the next feeding and they went back to normal.
This is what the plant looked like the day after watering.
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You can try to give a bit extra water, I dont know what your feeding schedule is like so obviously only do it if it fits the criteria. Under and over watering seems to have generally the same appearance/symptoms.