I have a leaf on one of my phals that did the same thing and it was a light issue when the leaf was growing. I had the plant in a spot where it was just a bit too dim, because I'd just salvaged it from a bad case of rot, so I put it in a darkish place, but where it still received some indirect light and the new leaf ended up growing almost completely vertical, with a little hook in it.
Totally my bad, but looking at yours, I'd bet you had a similar situation, where that leaf just didn't get quite the right amount of light and it got a bit wonky.
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