Font not rendering properly in Godot

Question

I am trying to use a font in Godot, and it is posing problems. The font is Karmatic Arcade.

Here are the font settings in my theme:

Here is how it looks in the editor:

And here is how it looks in-game. Notice how there are more lines, and a few transparent pixels as if antialiasing or filter is turned on.

Does anyone know what is going on here?? I have similar results with other fonts, but not all of them.