make sure you are not mistaking bronze for gold, keep checking all manufacturer events, make sure for championships you have a gold, not just for the single races, there is no arcade mode or license % like in GT3. just keep on checking, 3.6% equals around 20 or so races, so you must be missing a few manufacturer events, keep chekcing and you will eventually find what you missed, good luck 👍 👍 👍