Isocurve outside the Surface

Hello
Idk why my isocurve lies outside the surface. I have attached images for reference.

from OCC.Display.SimpleGui import init_display
from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeEdge, BRepBuilderAPI_MakeWire
from OCC.Core.TColgp import TColgp_Array1OfPnt
from OCC.Core.gp import gp_Pnt
from OCC.Core.Geom import Geom_BezierCurve
from OCC.Core.BRepOffsetAPI import BRepOffsetAPI_ThruSections
from OCC.Core.BRepAdaptor import BRepAdaptor_Surface
from OCC.Core.Adaptor3d import Adaptor3d_IsoCurve
from OCC.Core.GeomAbs import GeomAbs_IsoU, GeomAbs_IsoV
from OCC.Core.TopExp import TopExp_Explorer
from OCC.Core.TopAbs import TopAbs_FACE

display, start_display, add_menu, add_function_to_menu = init_display()
def create_curve(points):
array_of_points = TColgp_Array1OfPnt(1, len(points))
for i, point in enumerate(points):
array_of_points.SetValue(i + 1, gp_Pnt(*point))
curve = Geom_BezierCurve(array_of_points)
edge_builder = BRepBuilderAPI_MakeEdge(curve)
return edge_builder.Edge()

# Define control points for two Bezier curves
points_curve1 = [(0, 0, 0), (1, 2, 0), (3, -1, 0), (4, 1, 0)]
points_curve2 = [(0, 3, 0), (1, 0, 0), (3, 4, 0), (4, 2, 0)]

# Create curves
curve1 = create_curve(points_curve1)
curve2 = create_curve(points_curve2)

wire = BRepBuilderAPI_MakeWire()
wire.Add(curve1)

wire2 = BRepBuilderAPI_MakeWire()
wire2.Add(curve2)

# Create the generator and add wires
generator1 = BRepOffsetAPI_ThruSections(False, True)
generator1.AddWire(wire.Wire()) # Extract the wire using the Wire() method
generator1.AddWire(wire2.Wire()) # Extract the wire using the Wire() method

# Build the shape
generator1.Build()
S1 = generator1.Shape()

explorer = TopExp_Explorer(S1, TopAbs_FACE)
faces=[]
while explorer.More():
face = explorer.Current()
faces.append(face)
explorer.Next()

# Assuming you want to draw an iso-curve on the first face
face1 = faces[0]

# Create an Adaptor3d_Surface from the B-spline surface
adaptor_surface = BRepAdaptor_Surface(face1, True)

# Choose a parameter value (u or v) for the isoparametric curve
parameter_value = 0.7 # You can adjust this value as needed
parameter_value1 = 0.9

# Create the isoparametric curve using Adaptor3d_IsoCurve
iso_curve = Adaptor3d_IsoCurve(adaptor_surface, GeomAbs_IsoU, parameter_value)
iso_curve1 = Adaptor3d_IsoCurve(adaptor_surface, GeomAbs_IsoV, parameter_value1)

bspline_curve1 = iso_curve.BSpline()
bspline_curve = iso_curve1.BSpline()

display.DisplayShape(S1, update=True)
display.DisplayShape(bspline_curve, update=False)
display.DisplayShape(bspline_curve1, update=False)

start_display()