General DiscussionWhy I won the game, it shows I lose?

You abandoned the game, you even mention it in chat about 35 minutes in.

Not actually, I was afk for about 2 min, and I come back to control my hero again? Why was that "abandoning"?

You weren't disconnected, but you were sitting at the fountain doing nothing and getting no exp... To avoid "abuse" the system treats those cases the same way.

And it was over 5 minutes actually.

ok, thanks. That is to say, to abandon the game is to lose it, whether your team win it or not.

Abandon = lose. That and 5 minute team dcs (after fb) are why DOTABUFF stats differ from DOTA 2 stats.