The method of move_to can't move horizontally.

[gd247217]

Describe the bug : the method of move_to can't move horizontally,Run the following code and you will find that the objects on the screen do not move completely horizontally, but are offset downwards. What is going on?

#vscode: 1.83.1
#python: 3.10
#manimgl: 1.6.1
from manimlib import*
class twosquare(Square):
    def __init__(self,**kwargs):
        super().__init__(side_length=1,**kwargs)
        self.UP_square=Square(side_length=1)
        self.UP_square.next_to(self,UP,aligned_edge=DOWN,buff=0)
        self.add(self.UP_square)
class MyScene(Scene):
 def construct(self):
     self.add(NumberPlane().fade(0.8))

     square_two = twosquare()
     self.add(square_two)
     self.wait(2)
     self.play(square_two.animate.move_to(RIGHT*4), run_time=4)
     self.wait()