OK I talked to both Manu and DestinyUnknown (who even deleted his post here after that), and while they haven't replied, I feel like I need to stop this mindless speculation.
I tried to recreate what had happened, and it was only turn 13 where the bug occurred, we were 5-5 at the moment, I was about to kill one of his Pokes and had one that only worked as death fodder. It seems Manu had completely forgotten about one of my mons, because he thought for some reason he was 5-3 (!), which wasn't true—in fact, that same Poke remained alive when I forfeited, so I dunno how he could simply forget about it.
I also told them that the problem with trying to get where we were, was that it was only a 3/50 chance of the events occurring as they were, so we'd need to play around 17 times in average without critical hits, which imo seems annoying. Since Manu either dissappeared or simply refuses to speak to me, I don't know what to tell you, which is why I said the decision should be left to Upstart, so that no one feels ripped off.
And really, I wish we had a declared winner discounting our match, but as it stands, it might be important....