I recently submitted a run that was faster than one of my past runs, and it got accepted. The problem is it didn't replace the slower run on the leaderboard and was obsolete instead.

Linking the run would be helpful

Here it is: https://www.speedrun.com/newer_mario_kart_wii/run/zq7x81rm

I think the category has Timer asc. turned on, where the slowest run has a higher place, you should message one of the moderators and get them to turn it off

Thanks for the help