After I got the Relic in Dingo Canyon, this happened:

It happened at a later point again. I don't remember where, but I can look up if need be.

Lol that literally happened to me today, except on Time Trials. There was also a lone silver star next to Dingo Canyon on the level select screen.

Never seen this happen before now. I have no guesses as to what causes it, other than some problems with emulation (broken iso, firmware)? Or maybe Crash really is that good.

It's normal and happens on console too. Somehow leaderboard gets corrupted.