Trouble with y axis position while moving camera2D

extends Camera2D

@export var player_node:Node

const CAMERA_MOVE_SPEED=100
const MAX_POS=50.0
const MIN_POS=-50.0

var current_pivot_position
var is_camera_moving:bool=false
var input=Vector2.ZERO

func get_input():
	input.x=int(Input.is_action_pressed("Right"))-int(Input.is_action_pressed("Left"))
	input.y=int(Input.is_action_pressed("Down"))-int(Input.is_action_pressed("Up"))
	return input.normalized()

func _process(delta):
	input=get_input()
	if input==Vector2.ZERO and not Input.is_action_pressed("Right") and not Input.is_action_pressed("Down"):
		is_camera_moving=false
		current_pivot_position=Vector2.ZERO
		position=current_pivot_position
	else:
		if not is_camera_moving:
			is_camera_moving=true
			current_pivot_position=position
		current_pivot_position.x=clamp(position.x+input.x*CAMERA_MOVE_SPEED*delta,MIN_POS,MAX_POS)
		current_pivot_position.y=clamp(position.y+input.y*CAMERA_MOVE_SPEED*delta,MIN_POS,MAX_POS)
		position=current_pivot_position

remember to assign the player node
also put this camera as a child of the player

Also check this out, moving camera with middle mouse button grab: