Just got 2 glitches in a row.  I did one of the Bandit quests (this one inexplicably throws two separate bandit+wolf encounters.  I would assume it should just be one encounter, either that foe or 2 bandits and 2 wolves).

First fight, Janusk took no damage.  The summary showed him as -2hp.  The next fight he was all fit and raring to go at full life again.

The second fight...well the screenshot will explain the bug:

Yeah, that wolf just did -858993460 damage to my familiar.  If it weren't for that minus sign, I'd be real scared!