The visuals for the percentage of rank gained/lost is severely bugged visually. I unfortunately don’t have screenshots and don’t want to wait another 1.5 hours to get them, so I’ll try to describe as best as possible.
The end of match screen where your progress bar goes up or down has shown a severe discrepancy between matches. One game, a win, rewarded me 125 points, which counted for about a fifth of the bar. The next game, a loss, deducted 100 points which counted for a tiny portion of the bar, probably not even 1/10th but still looked as if it dropped “100” points. The visual error is in the bar not starting where it ended off on the win, but has already reduced to the loss marker where it visually would “shrink” to.