Everything's Italics

I published a new version of my Storyline project and all of a sudden, all the non-heading text is being rendered in italics (plus, a few symbols and ligatures were randomly tossed in).

I'm seeing the same thing in Preview.

It's a non-standard font, but I use it all the time without issue and I'm not experiencing any issues with it in other programs.

Anyone else ever experienced something like this?