A pretty massive (literally) bug has surfaced in Overwatch during its current Retribution event. The big Heavy Assault units that are playable in the Retribution event are popping up in normal matches as well. This is a huge issue, not just in size of the heroes, but also for the average player because of the hit points and damage counts for Heavy Assault units.
In Overwatch's Retribution mode, the higher hit points and damage are balanced out by all of the players having the same advantage. This of course isn't true in normal matches, where players have been finding themselves up against these juggernaut units completely unable to match them. The bug was revealed on Twitch and YouTube through Reddit, and mainly showed Korean or Chinese matches. It's uncertain as to whether or not this bug/hack was localized to Asian countries, or if it was more widespread.
Either way, Blizzard has issued a hotfix to correct this problem, so hopefully it will no longer be an issue. Did you or a friend see any Retribution characters in your regular Overwatch matches?