Whenever I beat the three Stadium Finals maps but do not gold medal one of the maps I cannot go back and better my times. I'm running platinum times but cannot beat the ghosts no matter what I do. They seem to be running best times in the world basically. This has happened to me on both Monster Mash X-cross and Highland Fling Supercross.

Also, when I try and view my friends replays or others on the leaderboards the option is grayed out.

I'm on XBOX

Thank you and sorry if this has been posted many times