BRepOffsetAPI_MakePipeShell build an invalid round corner Shell.

Please see the uploaded data files and images:
Below codesnippets can be help to build the PipeShell.

TopoDS_Shape aSpine = // load from Attachment 5 (BREP)
TopoDS_Shape aProfile = // load from Attachment 4 (BREP)
BRepOffsetAPI_MakePipeShell aMakePipe(TopoDS::Wire(aSpine));
aMakePipe.Add(aProfile,Standard_False, Standard_False);
aMakePipe.SetTransitionMode(BRepBuilderAPI_RoundCorner);
aMakePipe.Build();