I have the same problem with our Canon cameras. when I imported from the flash card they all duplicated? So in Premiere they all had different file names but the video was the same? I really dont know what is going on. anyway the only solution I could find (i was running out of time to find a proper fix) was to use a third party encoder (not Media encoder, that didn't work) and change them into mp4 so then I could import into Premiere with no problems. Trouble is this is a step I really dont wan...