Now that I'm looking more closely, this looks like some sort of initial aspect ratio issue, possibly related to a resize.

The game launches and the window either starts maximized or it maximizes itself. If I restore (un-maximize) and re-maximize, the aspect ratio is clearly different because the logo in the center of the screen gets slightly taller (while staying the same width).

In other words, the initial aspect ratio of the graphics seems incorrect (squished vertically slightly for me, running at 1920x1080).