Rated Solo Shuffle Mount/Saddle progression, wat?

Ok, so I win 4 matches in a row against people 1520 something while I’m 1520 something, 2 matches had 4 rounds won and the other 2 were a tie

No saddle/mount % progression

Go play a game where someone leaves in round 1, round instantly ends but the game doesn’t. It plays out like normal, timer counts down, door opens, that round ends, this happens 5 more times

I gained 3% saddle progression

Makes perfect sense.