Mistake? I thought having MR (for a male) attached to one's first name was SOP. I'm now looking at my documents for two upcoming trips.
One was made through a travel agent. On the itinerary provided by the TA, I'm down as SMITH/JOHN MR, but on the airline's online Travel Reservations Details I'm down as SMITH/JOHNMR.
The other trip I made online directly with the airline. I'm down as SMITH/JOHNMR.
You have nothing to worry about.