I am trying to change the custom trophy icons, I added each icon and saved, but the old icons still show up on the leaderboard. Is there a way to fix this?

It only affects new submissions I believe. You need to resubmit the existing runs.

No relation to new or exist runs. You probably need to clear the browser cache, try refreshing the page with Ctrl+F5.

The problem has been fixed, turns out all I needed was patience lol, thanks for the help!