Reload the race . I'm litteraly in a GR3 race with a different ordeJust done a custom GT3 race at Le Mans and it was the usual grid with the BMWs 1 and 2 so has not changed for me.
That's odd , I tested it today and got the same order . Last night I was getting random grids . I even have screen shots .Not working for me in GT3 class in either custom race or arcade with inter opponents I only get the two BMWs one and two on the grid. Tried about 8 times and have also restarted GTS in case the various updates had not kicked in fully.
Please let me know what race config you are using.