When I look at the emoji they show for the "grinning face with smiling eyes", three of them strike me as being nowhere close to that description. But I am espec

When I look at the emoji they show for the "grinning face with smiling eyes", three of them strike me as being nowhere close to that description. But I am especially intrigued that the three of them all fail in the same way: the mouth is flat with teeth bared, like a growling dog. I interpret that as much closer to a grimace than a grin. What's really interesting about that is that it seems like a really unlikely mistake to make. Grins bend the corners of the mouth upward, yes? Surely not many people would say no? At least in the cartoon language of emoji, I would have expected that to be universally agreed upon. That suggests to me a common cause rather than independent error. Was it a mistake that propagated through copying? Did one initial mistake become established through usage as meaning something different from the specs? Something else? It would be interesting to know the lineage of these faces and to understand where the mistake was initially made, and if perhaps it was perpetuated intentionally. None of the other emoji have misconstrual measurements anywhere close to that one, which suggests a story.