Thanks very much @Mr_Scooty. I also had this distorted screen issue.
And also had this “+0xp” even if I win. Coupled with big drops in mmr. Had to laugh it off.
I am aware of horrible internet sabotaging the arena(it is typical for us here in the Phil.) But the second link you shared answers it now.
Your problem on the second link also occurred to me.
And now I know the exact culprit:
You have unstable internet connecion before playing arena
You click “ranked match”.
“Finding opponent” takes unusually long.
You think. “Oh well. Must be my internet issue again.”
Then you clicked “cancel”.
Your in-game display shows that it stopped looking for matches and you go check your stats. Looks untouched. Maybe I’ll try it again. After a few failed attempts, you stopped.
Hours later(or at least 1.5 hours after according to @Mr_Scooty), you play arena again.
Boom!!! Your hard-earned points are scaled down +plus you take loses.
The second link you shared @Mr_Scooty answers this
Lesson learned(esp. for players in the Phil.):
If you are unsure of your internet connection,
do not touch this:
If you have bad internet and you cancel, the server will treat it as a lost match. You will lose points and add lost matches, if you cared about them.
Once again, thank you very much @Mr_Scooty!