I found (what I think is) a bug involved with switching between full screen mode and distration-free full screen mode. Specifically, if you go into full screen, then into distraction free mode, then back into full-screen mode, it doesn't return to full screen mode but does leave your text in the middle of the screen.
F11 - Switch to full-screen
Shift+F11 - Switch to distraction-free full screen mode
F11 - Switch back into full-screen mode
Note that you can fix the text being misaligned by appending a Shift+F11 at the end of those 3 commands.
Looks like a boolean isn't being flipped somewhere based on fullscreen/distraction-free mode.