Looks like that leaf is still young and hasn't finished elongating. I think flopped over because the base of it is still growing so it's tender. I'm not sure but maybe it was from drying because it is still tender.

I wouldn't worry too much the leaf will be fine. It's better to underwater than overwater, especially with sphag, and phals can tolerate some drying

To analyze the plant some more it's been getting good light and I see it has turned red. Perfectly fine and healthy.