Dock thumbnails misnamed in Finder

Several iterations now I've found that open Finder windows listed in the dock are misnamed, constantly and depending upon longevity (ie how long I want to access files etc.) the 'error' name sometimes creeps to other windows.

Leaving a pattern of 'This Folder1', repeat 'This Folder1', repeat...

My work pattern is only over a few days, but the repetition of a single window title being duplicated, yet the window beneath it is correct, is annoying to say the least.

Never seen this problem in 30 years of Mac usage...

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