Is this generally normal?
unnamed.gh (6.7 KB)
Default scale factor “F” of [Scale] component is 0.5
Everything is doing what is supposed to do.
What are you trying to do? What is not working as you wanted?
In Rhino, Untrim works differently. Here the component works somehow incorrectly. I see cutting where the surface is simple? And after Scale everything looks right.
Please, post examples (picture or rhino file) of what you would expect from grasshopper.
Be more specific.
Well, the result is generally correct, but the display is strange. Why does the green surface not reach its edges?
What makes you think it should?
Must be so. Otherwise, the result is confusing when viewing. 
where is the problem exactly?
Surface is displayed incorrectly.
how ? can you show this
See the difference?
GH shows the first picture, and correctly show the second picture.