Wooo!! Congrats on the sub-60!!!
I think I know what the cause of the bug is. If the http request to the lootlocker servers returns null values, I have it print out 99:99:99 - ?? (to fill in the blank spots when the game was first uploaded and no one submitted yet)
So what happened for you was the request got messed up halfway through somehow. I built in a small delay to give the servers time to respond but it's a strict timer ... not actually waiting for confirmation from the servers...
I think that's something I could definitely figure out next time I do leaderboards! I really struggle a lot with UI coding lol. Thank you for that report!