PDF printing all text in one wrong colour

Help gratefully accepted.  I have received a pdf which I'm trying to print.  It displays perfectly on my screen.  Most of the text is in black; the para headers are in orange, for ease of reading. 

The entire text, however, prints in orange.  Even when I check greyscale, it prints everything in orange.  When I convert it to a word docx, it still prints in orange.  I have tried various online ideas but I'm at my wits' end.  Other pdfs print in accurate colours.  

I'm using Acrobat Pro version 2024.002/20893 on a Macbook with M1 chip and an Epson printer.  Many thanks!