When you have 14 wins in the 4 star arena.
Fighting a hard Megatron team.
Win first game, nice.
Lose second game, shoot.
Win third game, nice!
End screen results.... Lost first two games
I actually noticed this happening to me for the first time last night. It made me wonder how many other times it had happened and I just didn't notice.
You still got the points for 2/3 wins though at least right? I don't think I've seen points go down, just an X on someone who should have won(and obviously a lost streak if there was an actual real loss).
edited May 2017
No you lose the points and the streak.
Arena bug strikes again!
This is a frustrating bug, and we totally get it. We thought we would be able to solve this before the last release, but that didn't turn out to be the case. The good news is that we do have a potential fix that we are pretty confident in coming soon! We're still testing it, but hope to have it out as soon as possible!