"Both impostor and imposter mean a person who deceives others by pretending to be someone else, but impostor is the more traditional spelling. 'Imposter' is a common alternative spelling that has been used for centuries and is widely accepted."
The reason this happened in a nutshell is The Internet. We got a blend. And that's OK. Language can evolve. It should evolve.
BUT IT'S FUCKING "IMPOSTOR" FOR THE RECORD. And yes, I will die on this hill because who wants to live forever, anyway, unless you're Peter Theil.. and and you see where that goes. Blood boys.