Floating "folders" after un-tabbing finder window

[urbanforces]

i've just "upgraded" to sierra and whenever i separate a tab from a finder window, a small folder icon appears on the desktop. sometimes it floats on top of other windows - see attached. it's really annoying - especially since i turned off automatically creating tabs instead of folder windows and it's still making tabs. any fix for this weirdness?

thanks

 

[CoastalOR]

The only thing I've found to recover from this bug is to restart the Mac. Another possible way to recover is to log out and then log back in, but I have not tried it.