Is this happened on all win 10 device? Onboarding script may be executed Multiple times on same device? Or its possible device offboarded and onboarded again with same name. usually inactive , offboarded device entries remain in MDE based on data retention limit set.
Thanks for your reply. It's a device I was using for testing so I'm not sure exactly. I have onboarding configured in Intune so maybe it got added after each Autopilot reset. It seems there's no easy way to clean it up so I'll just have to wait I guess.