Why are there more lines drawn

[asd513921]

Hello, I drew the coordinates of the line entity with plt, and why are the line segments different from drawing the entire model?

def main(dxf_file):
    doc = ezdxf.readfile(dxf_file)
    msp = doc.modelspace()
    lines, texts = process_entities(msp)
    draw_image(doc,msp,'output123456.jpg')
    plot_lines_and_cells(lines)



def draw_image(doc,msp,img_path):
    print("开始绘制：" + img_path)
    fig, ax = plt.subplots()
    ax.set_aspect("equal", "box")
    ctx = RenderContext(doc)
    ctx.set_current_layout(msp)  # modelspace is the default!
    out = MatplotlibBackend(ax)
    config = Configuration.defaults().with_changes(
        min_lineweight=0.01,
        lineweight_scaling=0.5,
    )
    frontend = Frontend(ctx, out)
    frontend.draw_entities(msp)
    out.finalize()  # explicit call required
    out.set_background("#0a0a0a")
    fig.savefig(img_path, dpi=200, bbox_inches="tight")
    print("绘制完成：" + img_path)
    plt.close(fig)

def process_entities(entities):
    lines_data = []
    for entity in entities:
        if entity.dxftype() == "LINE":
            start_point = Vec3(entity.dxf.start)
            end_point = Vec3(entity.dxf.end)
            thickness = max(entity.dxf.thickness, 10.0)
            lines_data.append(
                {
                    "start": [start_point.x, start_point.y],
                    "end": [end_point.x, end_point.y],
                    "width": thickness,
                }
            )
    return lines_data

The results of these two functions are respectively

I don't know where those lines in the bottom left corner of the first picture came from, does anyone know? Thank you very much!