I found another bug with the website today. Wix by default limits queries to 100 entries, so when calculating the leaderboard, users who had submitted more than 100 times were not having all entries considered. I have fixed this and set it to the max of 1000 entries. However, if one were to exceed 1000 submissions, it would be very difficult for us to calculate leaderboard correctly.
1000 is a large enough number that this should not be a problem for anyone. This limit would only come into play if one were to try to brute force a solution, for which we already have numerous countermeasures, so I strongly recommend against it.
To fix this, just submit to any challenge again and the leaderboard will update itself.