Mentioned this in the Weekly Challenge thread - but I somehow managed to 'clear' my progress in one of the events...
I did the event at Autopolis twice, winning both times on Normal difficulty, and received the 100,000 Cr. prize for that (top picture).
I then completed the Porsche event at the Nurb, meaning I had cleared two events (middle picture).
I then switched to Hard difficulty and did the race again, this time finishing in 6th place - after this, I realised that the event was now marked as not done (bottom picture).
I then did the race again on Normal difficulty, and despite lapping quicker than before (and setting purple laps), I could only finish a relatively distant 3rd place; however, this registered as completing the event.
Finally, I switched back to Hard difficulty to see if it would clear the event progress again if I finished outside the top 3, but this time it did not clear the progress and all appears to be back to normal...
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edit: Well, well... I did it again and finished 5th, and it has cleared again... now to see if winning it gives me another Credit Ticket...
edit 2:
now to see if winning it gives me another Credit Ticket...
No, it's doesn't... 😢