Hello, I have a novice trophy on all the single player races. The only problem preventing me from opening the big door to get the final challenge is the "nitro challenges". On the two nitro challenge maps, I am able to complete within the specified challenge time and collect the number of nitro boosts mentioned before starting the challenges, HOWEVER; the end of the levels only says that I finished it, it does not provide a trophy, and the story mode map never updates to show a trophy indicating completion. Why don't these two nitro challenges update as completed? Am I missing something or is it a bug and the big door forever unreachable?
Please see attached image after completions.
I'm counting my nitros and I know I collected at least 12 (10 was the requierment). The only options after successful(?) completion are to return to the main story mode map, or to restart the challenge. Any ideas as to what to do?