Somehow, a few days ago, the Site started to show only IGT on all Leaderboards. And on leaderboards where there is no IGT, only the Name is shown, but not the Times.. I have no idea what triggered this, and i can not find an option to disable this. Tried to find help via searching on Google but that got me nothing. Would be nice if someone could help me out here :)

This is a reported bug. On mobile devices in portrait mode, you will see only the place, username, and IGT if it exists. If you rotate the device to landscape mode, you will see the RTA times just fine.