@Animositate I've seen similar glitches where my squad-mates rankes sometimes shows as bronze (should be plat) before they've exited the current match completely by exiting the after-game-stats and such. This is probably just a glitch, and it does not affect your real rank.
@Godisbullen That is in no way related to what happened to me. I won a game, pressed space to exit to lobby and it didnt show the score screen. NO XP, NO WIN ON CHARACTER.