Do you have xwp shadow icons enabled???
What you are seeing is the default ArcaOS shadow icons. When enabled, it only shows when Dynamic icons are not enabled also.
In the forum under
Windows and graphic design
David’s doubles
Page 16
I had created a few alternatives.
To disable, do the following:
Open system setup folder
Click on the Workplace Shell icon
Select the Folder View tab
Uncheck the Mark Shadows box
Close the WorkplaceShell Properties
Restart desktop