Right now, the exp multiplier is broken. You still get normal exp if you win a match. Example: I win a game of fallen. Before the game, I had 200 exp. On the triumph screen, it says I gained 125 exp. However, when I go back to the lobby, I still only gain 100 exp, putting me at 300 exp , instead of 325.
Another broken thing about the exp is that when you lvl up, your exp gets reset to 0, no matter how much exp you gained before leveling up. EXAMPLE: I'm 35 exp away from reaching... say lvl 161. It doesn't matter if I get 35 exp, 80 exp, or 150exp, when I lvl up, my exp gets reset to 0. I'm 90% sure this is not intentional.