Okay, now I see what you were looking at. The way you were talking I thought all of them were completely screwed. The ones I checked were perfect and fully updated.

From what I can tell the Zone and Detonator boards look like they're putting scores in where they shouldn't be, probably a database problem. After scanning over the majority of SL and TT tables, they are perfectly fine aside from the odd glitched times here and there that can be easily spotted. There are obviously more odd times in the race tables, but SL have said they will be removing dodgy times from the 2048 leaderboards during scheduled maintenance, mention these times to them with screenshots and I'd expect they will do the same with the HD boards. Especially now they're updating again.