Getting low elo for winning


I just played a game of faceit premium. I’m currently lvl 7, and this game consisted mainly of lvl 9-10. We won the game, and i had a decent score. Even though I should be awarded for wining a game were i am “the underdog” i got 17 elopoints, where the usual award is about 25 elopoints.
What decides how many elopoints you get, and why did I only get 25 elopoints?

Link to game: