Why does Lumia Photo Transfer for Mac duplicate some of my photos and videos after the transfer?

If you transfer photos taken with Lumia Camera, both the high-resolution (5MP) and the full-resolution (for example, 19 or 34MP, depending on your phone) version of the photo are saved to your Mac. If you have taken DNG photos, both the high-resolution (5MP) and the full-resolution DNG (for example, 19 or 34MP) version are transferred to your Mac.  

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Nokia Lumia Icon,Nokia Lumia 1520,Nokia Lumia 1320,Nokia Lumia 1020,Nokia Lumia 928,Nokia Lumia 925,Nokia Lumia 920,Nokia Lumia 830,Nokia Lumia 822,Nokia Lumia 820,Nokia Lumia 810,Microsoft Lumia 735,Microsoft Lumia 640,Nokia Lumia 635,Nokia Lumia 630,Nokia Lumia 620,Microsoft Lumia 535 Dual SIM,Nokia Lumia 530,Nokia Lumia 520,Microsoft Lumia 435