I have just one Phalaenopsis in my collection that has similar-looking lengthwise waves in its leaves, though not to the apparent extent of yours. It's always been a healthy plant, and I've just thought maybe there's something in its genetic background that causes that. Quite a few of my others, while they don't have the actual "waves," have hints in the pigmentation of lengthwise "striping" for lack of a better term.
As others have expressed, I wouldn't worry about it, just keep up the good culture! It looks happy and healthy.
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Cheri
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