By default FMP brings in formatting when you copy/paste. Is your colleague putting this in a data field? If so, the database might have the field defined to remove formatting, just as I do in our database. A sign is if they paste, see the formatting, but on Tab it all goes away again.
Or are they trying to put this within a script? In which case I don't know how to do it easily--I've applied formatting to strings in that situation, but it's like tagging HTML by hand.