It has happened in a considerable number for a year now, in all possible variations. Courses, 18 and 9 holes, single and unlimited play have been mixed up uncountable times. The very apex was when Pebble (9 holes) appeared in an 18 hole credit bracket (which was quickly aborted).
WGT have often said that "QA is looking into it", to no avail. This is one of the issues which support rumour that the QA department has been relocated to Bielefeld.
And @Tux, if you wanna play RSG just look at the banner you posted - it shows St. Georges!