Something uses 64 gigs in "iCloud Drive" and I can not understand what

As you can see below, iCloud uses a ton of space

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When I try to manage iCloud storage in this screen, I get it indicating that it is the top level of my iCloud storage.

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Which seems pretty simple. But when I try to look in the viewfinder, I see that ..

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Who checks the use of space, but a little lower indicates 609 MB on the disk? In this folder, nothing takes up so much space. I can not for life to understand what is happening here.