I've made a custom pixel art font(a custom ttf file) for one of my upcoming games. However, when I use the font in-game many of the letters turn out strangely proportioned.

As you can see, both the V and O become kind of lopsided. Is this due to something in the Godot engine or did I not make the font right?

When I open the ttf file it seems perfectly fine

It may be the font size, depending on how you made the font (if it's pixel based) it may only have certain sizes. It could also be anti-aliasing, I think there is a setting in Godot on the font.