def increase_score from Scoreboard does not work as intended as the turtle leveled up (at line 40 main script and line 22 scoreboard script)

car_manager.py

COLORS = ["red", "orange", "yellow", "green", "blue", "purple"]
STARTING_MOVE_DISTANCE = 5
MOVE_INCREMENT = 10
game_is_on = True

from turtle import Turtle
import random

class CarManager():

    def __init__(self):
        self.auto_list = []

    def auto_generation(self):
        random_number = random.randint(1,6)
        if random_number == 1:
            new_car = Turtle()
            new_car.color(random.choice(COLORS))
            y = random.randint(-250,250)
            # Size and shape
            new_car.shape("square")
            new_car.shapesize(stretch_wid=1, stretch_len=2)
            # car color
            new_car.penup()

            new_car.goto(290, y)

            self.auto_list.append(new_car)

    # this will only create one car that keeps going to different position in the while loop
    def movement(self):
        for new_car in self.auto_list:
            new_car.backward(STARTING_MOVE_DISTANCE)

    def speed_up(self):
        x = STARTING_MOVE_DISTANCE
        y = x + MOVE_INCREMENT
        x = y

main.py

import time
from turtle import Screen
from player import Player
from car_manager import CarManager
from scoreboard import Scoreboard


screen = Screen()
screen.setup(width=600, height=600)
screen.tracer(0)

screen.listen()

# creating objects
player = Player()
car = CarManager()
scoreboard = Scoreboard() ####

# Game on
game_is_on = True
while game_is_on:
    time.sleep(0.1)
    screen.update()


# cars
    car.auto_generation()
    car.movement()

# collision
    for cars in car.auto_list:
        if player.distance(cars) < 20:
            scoreboard.game_over()
            game_is_on = False

# speed up and level up
    if player.level_up():
        car.speed_up()
        # increasing score
        scoreboard.increase_score()


    # if player.ycor() < 280:
    screen.onkey(player.move,"Up")

screen.exitonclick()

player.py

STARTING_POSITION = (0, -280)
MOVE_DISTANCE = 10
FINISH_LINE_Y = 280

from turtle import Turtle

class Player(Turtle):
    def __init__(self):
        super().__init__()
        # Turtle setup
        self.penup()
        self.setheading(90)
        self.setpos(STARTING_POSITION)
        # Turtle features
        self.shape("turtle")
        self.color("Black")
        self.shapesize(1,1)

    def move(self):
        new_y = self.ycor() + MOVE_DISTANCE
        self.goto(0, new_y)

    def level_up(self):
        if self.ycor() > FINISH_LINE_Y:
            self.setpos(0, -300)

scoreboard.py

FONT = ("Courier", 12, "normal")

from turtle import Turtle

class Scoreboard(Turtle):
    def __init__(self):
        super().__init__()
        self.penup()
        self.hideturtle()
        self.score = 1
        self.goto(-200, 260)
        self.update_scoreboard()

    def update_scoreboard(self):
        self.clear()
        self.write(f"Current score: {self.score}", align="center", font=FONT)

    def game_over(self):
        self.goto(0, 20)
        self.write("Game Over!", align="center", font=FONT)

    def increase_score(self):
        self.score += 1
        self.update_scoreboard()