I've edited text on a pre-existing A4 document, but when I email the revised doc as an attachment or via a link, the recipient sees the documents on her screen in the right colors, but when she prints them, one paragraph shows up in the color of the title

I've edited text on a pre-existing A4 document, but when I email the revised doc as an attachment or via a link, the recipient sees the documents on her screen in the right colors, but when she prints them, one paragraph shows up in the color of the titles, not black like the rest of the text. They're overseas, for what that's worth. Help, please.