Multiplication track with USB in Rasp pi 4

Hi everyone, 

I installed my setup the last week with a Rasp Pi 4 4GB, hiffiberry AMP. I put my musics files in an usb key. 

But when I take USB in my computer to add some musics, in raspberry I can find a multiplication for each music files. 

How can I repare it ? 

Have a good day !


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