ignore selles ignorant crap

your findings are correct because your seeing a huge difference between the horizontal and vertical aspect ratios. If you drew it sideways correctly and rotated 90 it would be squished in the vertical. You were spot on with your 1:1 guess.
On a real CRT I would expect you to see the same behaviour because your shape still has more vertical lines than horizontal lines.
(ps. cosmigo promotion kicks ass!)