Speedrun bug/glitch ?

[MJT]

I started to try speedrun levels. First try : ok I made 2 minutes 26, wasn't that bad but not enough to reach the bronze medal.
Si I tried more and more and everytime I made like 2 or 3 minutes more than the first try. Even when I'm running like a mad man. It's like he counting me minutes.
Does anyone experienced the same bug ?

[Crazywabbit]

Do I have to speed run this game?