I can't see the whole plant and I could be wrong, but you could have a variegated Monstera on your hands.
https://thursd.com/articles/monstera-deliciosa-albo-variegata-the-most-expensive-plants-in-the-world
My own Monstera is doing well, and I don't water it too often. Usually once a week and limited. But I have the feeling that all plants are a little different. It could also lack nourishment.