They are hidden files, I guess some kind of meta data that OSX uses, so not actually a duplicate. It's no problem when I'm on my Mac; The files remain hidden there in the background, no big deal.
The problem comes when I have folders going back and forth between my Mac and my PC.
When I do, I see this;
_
Trying to fill the unforgiving minute
with sixty seconds' worth of distance run.
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