Hello, I noticed a surface error that was created with BlendSrf, when the operation is repeated, the error disappears. If you move any point of the surface - the error disappears.
1.3dm (562.5 KB)
Hello - it looks like any adjustment to the analysis mesh settings will clean that up.
-Pascal
Tried - it’s useless 
Hello - BlendSrf will generally add multi-knots - and in any case they run the other way - the problem looks to me like it’s in the analysis mesh. Refreshing that to a new setting - say without the max edge length setting - should clean up the display.
-Pascal
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At the site of the defect, the polygons are a bit strange (elongated).