Vectors farther from the origin are bigger

Hey! I'm just trying to plot some vectors. I'm noticing that vectors farther away from the origin are much bigger (arrow heads and line width) than others.

Is this expected behavior? I picked this library after watching "Essence of Linear Algebra," and it seems like there, arrow size is not influenced by distance from the origin.

Sample Code:
`from big_ol_pile_of_manim_imports import *
import math

class ExampleBigVectors(VectorScene):

def construct(self):
# Add a grid
self.add_plane()

# Make some vectors
self.add_vector((0.5,0.5))
self.add_vector((-4,4))
`
[Produced output](https://imgur.com/a/XHGyrSQ)

On OSX High Sierra, 10.13.6. Fresh install today.