Is there some sort of delay between when the result is submitted, and when it’s displayed on the leaderboard?
E.g. according to the leaderboard, my latest submission was on 21.10, although the “Submissions” tab shows that there are several submissions from today 
Or it has something to do with the Round 1 – Round 2 transition?
Hey,
The original leaderboard is not updated once the challenge ends. You can check the post-challenge leaderboard for the solution you submitted after the challenge ends using the leaderboard filter.
Regards
Ayush