You need to check the Box at the leaderboard "Ascendig order"
@Noaxen - I tried that for a speedrun leaderboard as well, which shows the results in the correct order- HOWEVER, lower times does not update the beaten time on the leaderboards. A higher time does :D
@WerwiewasAnanas have you found a solution? If not, check out my comment (most recent comment on here) or contact me on discord: Kepsert if you need assistance :)