It seems the random encounter generation gone completely bonkers between the last beta and the final version.

For my lvl 2 party I encountered a pair of Mature Athach as a random encounter. A "normal" Athach alone is a CR12 encounter, and these guys seems to be even tougher.

Also, you can't run away from a random encounter, as you can't leave the map if there are enemies. I don't know if it's intended or also a bug. (not that it mattered in the above scenario, as those guys are very fast, and kill me before I even reach the exit)

For me it was only a frustrating experience (and load last save), but encounters like this make Ironman mode completely unplayable.

It seems I'm not alone with this problem, as I seen other players meeting a pack of werewolves as a random encounter at lvl 2.