And this is really bizarre, but... apparently the bold text didn't come through as bold. It's just... normal.
The ebook shows the bold text. The original document shows the bold text. It's ONLY the print PDF, which I didn't think to check, because literally the only thing I do to convert the ebook to print PDF is click a box. It never occurred to me that bold text just... wouldn't come through, for some reason.
What? Computer, how? I'm so confused.