I think I might not have added the glyph for the apostrophe and instead rely on another font in the stack to get it. I don't know. I'm still upset by this.
Yeah, it's an error with my font stack and not Binchotan. Good. Switched that up for now but now apostrophe seems to be a fullwidth character. I guess Maybe I need to dig up the sources for Binchotan at some point and add that character. I don't know when. But I'll try to remember that, since it bothers me so much.