OK. Imho.
The size of the plant has quite a story to tell.
If it's been feeding the same, and growing faster than the others. Then it has more roots too.
Plants that are in pots too small, will droop. I realise your pot isn't too small. But you're not using your airpruning pots effectively.
The bottoms of your pots aren't in the air. It's dark, and wet underneath. The plant thinks there is more soil, and is shooting new roots down. You need to sit the pots a couple inches in the air. So the bottom prunes as well.
Usually plants in small pots, start to suffocate, when their roots hit the container. Then they also start dropping older growth to compensate. They get nutrient deficiency as well. Even if there's plenty there.
My advice would be to add a tray with lots of drainage holes that your pots can sit on, to get airflow underneath, and start airpruning.
Some of your fans look magnesium deficient as well. Keep an eye on your other plants. If they start to show magnesium signs too, hit me all with some ebsom salt.
Otherwise if it's just one plant. I think it's just your pot.