Hi @jabriera Welcome to the Forum 
You may find something useful within this:
https://discourse.shapr3d.com/t/move-spline-control-point-in-more-than-2-axis/6563/7
Just below this there is a .shapr File.
You may be able to determine what was done at the problem junction.
Perhaps you could do something similar with a temporary surface that you could Tools > Project onto and then Sweep along the resulting curve?
If you need more help please shout.
Happy S3Ding