Leaf pleating again?

[3rdMaestro]

Hey everyone!
Here's the story: I have 2 oncidium twinkle that I'm growing. I tried one once before when I was much newer and had a problem with leaf pleating, likely from not watering enough. Since then I have shifted things around in the house, adjusted growing conditions a bit, and got two new oncidium Twinkle plants mentioned above. They are both putting out new growths now and in order to make sure they don't pleat, I've really tried to stay on top of watering (I water every other day, and every other watering I fertilize with MSU fertilizer, and humidity is 50%) but STILL one of the new growths is showing a smidge of pleating. Do these oncidiums want even more water than what I'm giving them? Or is it possible that something else can cause leaf pleating beyond lack of water?