I have an image clip which I am applying a rotate to

image_clp_rotated = image_clip.fx(mp.vfx.rotate, rotate_emoji, expand=False)

The method

def rotate_emoji(t):
    """Calculates the rotation angle for each frame."""
    if int(t) % 3 == 0:
        return -20
    elif int(t) % 2 == 0:
        return 20
    else:
        return 0

This is the image before rotate is applied

This is the image after it has been rotated.

Why is the circle effected like this?

Note:

Image clip is a CompositeVideoClip of the circle and the emoji clips.

image_clip= CompositeVideoClip([circle_image_clp, emoji_image_clp])