I was playing today and noticed a lot of leaderboards have people on them with completion times of zero for some levels. I know that's not possible, so are we seeing something like limbo again where there will be cheating scores at the top of the board all over again, or am I glitched?

You're not glitched. All the same the creators have announced that they will soon release a fix.

I noticed that too.

Yeah, there is a glitch to get 0.00 seconds on most levels.  Like piderman said, they are working on a patch to fix the glitch and some bugs as well.  When that patch is coming out, I don't know.

I'm 8th on the leaderboard on an early hospital level with a time of 0.00...I don't even know how I got it, so it's not as though everyone up there is trying to glitch, I certainly wasn't