That's OneDrive's "magic work" every time you hard reset your phone. It reads your SD card, uploads your pics, videos, etc to OneDrive and if you already had them there, you'll see them twice... and if you reset your phone again, it does it again.. so you'll see 3 of the same! and so on... Cant find a way to just tell OneDrive to start uploading camera photos from THAT moment on, but do NOT upload existing pics in my SD card :/