I have no answer WHY?
But I have on occasion had it happen a few times
Not an answer,but a suggestion,,,when you done drawng,,, do planar and project curves to surfaces,,,however that ain't a good answer really
I don't have it happen too much,,,I also have a feeling when you "sometimes" do an Entity summary and you notice some stuff off by a few tenths,,,,sometimes yes and sometimes NO,,,actually Entity summary is what you call "Bounds" data and it don't always tell you exactly the place in space...I really don't know how to explain it,,,but I know some do,,,hopefully they chime in