Greg
Sadly, none of you have truly explained what happened Vinicius.
While 0xp may be due to the level of competition, what his screen shot appears to be of is a visual bug that was around several months ago. If you pulled up that summary page too soon after the race it would show 0 xp and a loss of all your rep. If he were to wait or refresh it would show the right number.
We would have explained it if we knew what happened, sadly we are humans and don't know everything, thanks for your help!