Seems that when refunding tier 1 ap upgrades in streetbrawl, the wrong amount is refunded, allowing for extra AP earlier on than expected.
MatchID: 71037341 - Seven player
Played this game trying to replicate that bug, seems that that is the issue, although may extend to normal mode, or higher AP upgrades
MatchID: 71037341 - Seven player
Played this game trying to replicate that bug, seems that that is the issue, although may extend to normal mode, or higher AP upgrades