Why Do I Have 2 Documents Folders In iCloud Drive?

One of the folders has an icon on it that looks like a document and there is nothing in it. The other folder is a plain envelope folder and has all the document files in it. These show up both on my iMac using High Sierra and my MacBook pro using Mojave. I have icloud turned on with option documents and desktop on both machines. Can I delete one of these folder and if so which one? Should I move the files in the plain folder to the one with the icon?
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