I'm using CURA 4.4. I was actually able to nearly eliminate this by tightening the y axis belt beyond what I normally would do. I'm still seeing a very slight almost imperceptible shadow of the issue but I was able to reprint the Eiffel tower that I showed in the picture and I happy. Is it possible this really was a belt problem that only affected those layer on just those faces? the back of the cubes I showed look good.