Maybe it was cross pollinated by a bee with a twisted hazel tree (do bees pollinate peace lilies?).
The tag said Spathiphyllum sweet rocco. I only bought it because I like the style of the plant and that I saw it in the film Hot Fuzz
I've just bought my Japanese Peace Lily today and wanted to check if it was suitable for cats because I live in a house with two cats and I'm not...