When using Construct Surface by Section or Network, the resulting surface appears to loop through some of the profiles.
The resulting surface is looping because of the interpolation of the B-Spline surface. The profiles, used to create the surface near where the looping is occurring, are probably too close together and the next and / or previous profiles are too far away.To correct the appearance of the resulting surface:Place additional profiles in between the far profile and closer to the profile that was previously looping. This will cause the B-Spline to be straight.